FCC ID: 2AATL-K255B-SR WIFI+BT Module K255B-SR

 

K255B-SR

Wi-Fi Dual-band 1X1 11a/b/g/n/ac +Bluetooth 5.0

Combo Module Datasheet

FN-LINK TECHNOLOGY LIMITED

Proprietary & Confidential Information

K255B-SR Module Datasheet

Office: 6 Floor, Building U6, Junxiang U8 Park,

Hangcheng Avenue, Bao'an District,

Shenzhen City, CHINA

Factory: No.8, Litong Road, Liuyang Economic & Technical

Development Zone, Changsha, Hunan, CHINA

TEL: +86-755-2955-8186

Website: www.fn-link.com

FN-LINK TECHNOLOGY LIMITED

Proprietary & Confidential Information

Revision History

K255B-SR

Version Date

Revision Content

1.0

2021/02/23 Draft version

Draft

Lgp

Approved

Szs

2.0

2021/03/18

Lgp

Szs

Correct typo;

Update RF specification;

Update Pin definition;

Add module picture

3.0

4.0

5.0

2021/04/12 Update marking description

2021/05/20

Update RF specification;

Update module picture

2021/05/21 Add general version module info

Lgp

Lgp

Lgp

Szs

Szs

Szs

FN-LINK TECHNOLOGY LIMITED

Proprietary & Confidential Information

CONTENTS

K255B-SR

1 Overview....................................................................................................................................2

1.1 Introduction......................................................................................................................... 2

1.2 Features.............................................................................................................................. 2

1.3 General Specification........................................................................................................ 3

1.4 Recommended Operating Rating....................................................................................3

※1.5 EEPROM Information....................................................................................................3

2 Wi-Fi RF Specification........................................................................................................... 4

2.1 2.4GHz RF Specification.................................................................................................. 4

2.2 5GHz RF Specification......................................................................................................5

3 Bluetooth Specification.........................................................................................................7

3.1 Bluetooth Specification..................................................................................................... 7

4 Pin Assignments..................................................................................................................... 8

4.1 Pin Outline...........................................................................................................................8

4.2 Pin Definition.......................................................................................................................8

5 Dimensions.............................................................................................................................11

5.1 Module Picture..................................................................................................................11

5.2 Marking Description.........................................................................................................11

5.3 Module Physical Dimensions.........................................................................................12

5.4 Layout Recommendation............................................................................................... 13

6 Host Interface Timing Diagram......................................................................................... 14

6.1 system power on sequence........................................................................................... 14

6.2 SDIO Pin Description...................................................................................................... 15

6.3 SDIO Default Mode Timing Diagram............................................................................ 15

6.4 SDIO High Speed Mode Timing Diagram....................................................................16

6.5 SDIO Bus Timing Specifications in SDR Modes.........................................................17

6.6 SDIO Bus Timing Specifications in DDR50 Mode......................................................19

7 Reference Design................................................................................................................. 21

8 Ordering Information........................................................................................................... 21

9 The Key Material List........................................................................................................... 22

10 Recommended Reflow Profile.........................................................................................23

11 Package Information.......................................................................................................... 24

11.1 Reel..................................................................................................................................24

11.2 Carrier Tape Detail.........................................................................................................24

11.3 Packaging Detail............................................................................................................ 25

11.4 Moisture sensitivity........................................................................................................ 25

FN-LINK TECHNOLOGY LIMITED

1

Proprietary & Confidential Information

K255B-SR

1 Overview

1.1 Introduction

and BLE mode.

1.2 Features

K255B-SR support 1-stream 802.11a/b/g/n/ac solution with MU-MIMO STA mode with

Bluetooth smart ready controller, SDIO 3.0 interface, HS-UART mixed interface.

It

combines WLAN MAC, a 1T1R WLAN baseband, RF in a single chip.

Module complies with IEEE 802.11 a/b/g/n/ac standard and the speed can achieve up to

80MHz bandwidth and PHY data rate of 433Mbps.

Module complies with Bluetooth core specification V5.0, support both classic BDR/EDR

 CMOS MAC, Baseband PHY and RF in a single chip for IEEE 802.11 a/b/g/n/ac

 Support 802.11ac 1x1, compliant with MU-MIMO STA mode

 SDIO 3.0 interface for WLAN, with rate up to 208MHz

 802.11ac support maximum rate up to 433Mbps in 80MHz bandwidth

 Support HS-UART and PCM host interface for BT

 Supports Bluetooth V5.0 features

 Dual mode BT 5.0 supporting BDR, EDR, LE1M, LE2M and LE8S rates

FN-LINK TECHNOLOGY LIMITED

2

Proprietary & Confidential Information

Block Diagram:

K255B-SR

1.3 General Specification

Model Name

K255B-SR

Product Description

Support Wi-Fi/Bluetooth functionalities

Dimension

Wi-Fi Interface

L x W x H: 15 x 13 x 2.15 mm (typical)

Support SDIO 3.0

BT Interface

UART / PCM

Operating temperature

0°C to 70°C

Storage temperature

-40°C to 85°C

1.4 Recommended Operating Rating

Min.

0

3.15

1.62

Typ.

Max.

Unit

25

3.3

1.8

70

3.45

1.98

deg.C

V

V

Operating Temperature

VCC33

VDDIO

※1.5 EEPROM Information

WI-FI

ID

TBD

FN-LINK TECHNOLOGY LIMITED

3

Proprietary & Confidential Information

2 Wi-Fi RF Specification

2.1 2.4GHz RF Specification

K255B-SR

-

-

-

-

Feature

Description

WLAN Standard

Frequency Range

Number of Channels

IEEE 802.11 b/g/n Wi-Fi compliant

2.400 GHz ~ 2.4835 GHz (2.4 GHz ISM Band)

2.4GHz：Ch1 ~ Ch14

Spectrum Mask

Min. b/g/n

Typ. b/g/n

Max. b/g/n

Unit b/g/n

1st side lobes(to fc ± 11MHZ)

2st side lobes(to fc ± 22MHZ)

-43/-30/-40

-52/-33/-58

-

-

Freq. Tolerance

Test Items

-20/-20/-20

-

Typical Value

20/20/20

EVM

dBr

dBr

ppm

802.11b /11Mbps: 15dBm ± 2.0 dB

EVM ≤ -9dB

802.11g /54Mbps: 16dBm ± 2.0 dB

EVM ≤ -25dB

Output Power

Test Items

802.11n /MCS7(HT20):

15dBm ± 2.0 dB

802.11n /MCS7(HT40):

14dBm ± 2.0 dB

TYP Test Value

SISO Receive Sensitivity

1Mbps

≤ -92 dBm

(11b,20MHz) @8% PER

- 11Mbps

≤ -82 dBm

SISO Receive Sensitivity

6Mbps

≤ -88 dBm

(11g,20MHz) @10% PER

- 54Mbps

≤ -71 dBm

SISO Receive Sensitivity

- MCS=0

(11n,20MHz) @10% PER

- MCS=7

≤ -87 dBm

≤ -69 dBm

SISO Receive Sensitivity

- MCS=0

≤ -84 dBm

(11n ,40MHz) @10% PER

- MCS=7

≤ -66 dBm

Maximum Input Level

802.11b: -10 dBm

802.11g/n: -20 dBm

EVM ≤ -28dB

EVM ≤ -28dB

Standard Value

≤ -85 dBm

≤ -76 dBm

≤ -82 dBm

≤ -65 dBm

≤ -82 dBm

≤ -64 dBm

≤ -79 dBm

≤ -61 dBm

Antenna Reference

Small antennas with 0~2 dBi peak gain

FN-LINK TECHNOLOGY LIMITED

4

Proprietary & Confidential Information

2.2 5GHz RF Specification

Feature

WLAN Standard

Frequency Range

Number of Channels

Test Items

Description

IEEE 802.11a/n/ac 1x1, Wi-Fi compliant

5.150 GHz ~ 5.850 GHz (5.0 GHz Band)

5.0GHz：Please see the table1

Output Power

Typical Value

802.11a /54Mbps:

14 dBm ± 2.0 dB

802.11n /MCS7(HT20):

14dBm ± 2.0 dB

802.11n /MCS7(HT40):

13dBm ± 2.0 dB

802.11ac /MCS8(vHT20):

13 dBm ± 2.0 dB

802.11ac /MCS9(vHT40):

12dBm ± 2.0 dB

802.11ac /MCS9(vHT80):

11 dBm ± 2.0 dB

Test Value

6Mbps

-

Test Items

Receive Sensitivity (11a,

≤ -88 dBm

20MHz) @10% PER

- 54Mbps

≤ -70 dBm

Receive

Sensitivity

- MCS=0

(11n,20MHz) @10% PER

- MCS=7

Receive

Sensitivity

- MCS=0

(11n,40MHz) @10% PER

- MCS=7

Receive Sensitivity

- MCS=0

(11ac,20MHz) @10% PER

- MCS=8

Receive Sensitivity

- MCS=0

(11ac,40MHz) @10% PER

- MCS=9

Receive Sensitivity

- MCS=0

(11ac,80MHz) @10% PER

- MCS=9

≤ -87 dBm

≤ -69 dBm

≤ -84 dBm

≤ -66 dBm

≤ -86 dBm

≤ -65 dBm

≤ -83 dBm

≤ -58 dBm

≤ -81 dBm

≤ -55 dBm

Maximum Input Level

802.11a/n: -30 dBm

Antenna Reference

Small antennas with 0~2 dBi peak gain

Conditions : VBAT=3.3V ; VDDIO=1.8V ; Temp:25°C

Note: The RF specification will be updated in future version.

K255B-SR

EVM

EVM ≤ -25dB

EVM ≤ -28dB

EVM ≤ -28dB

EVM ≤ -30dB

EVM ≤ -32dB

EVM ≤ -32dB

Standard Value

≤ -82 dBm

≤ -65 dBm

≤ -82 dBm

≤ -64 dBm

≤ -79 dBm

≤ -61 dBm

≤ -82 dBm

≤ -59 dBm

≤ -79 dBm

≤ -54 dBm

≤ -76 dBm

≤ -51 dBm

FN-LINK TECHNOLOGY LIMITED

5

Proprietary & Confidential Information

15GHz(20MHz) Channel table

Band range

Operating Channel

Channel center frequencies

Numbers

(MHz)

K255B-SR

5180MHz~5240MHz

5260MHz~5320MHz

5550MHz~5700MHz

5745MHz~5825MHz

36

40

44

48

52

56

60

64

100

104

108

112

116

120

124

128

132

136

140

149

153

157

161

165

5180

5200

5220

5240

5260

5280

5300

5320

5500

5520

5540

5560

5580

5600

5620

5640

5660

5680

5700

5745

5765

5785

5805

5825

FN-LINK TECHNOLOGY LIMITED

6

Proprietary & Confidential Information

K255B-SR

3 Bluetooth Specification

3.1 Bluetooth Specification

Feature

Description

General Specification

Bluetooth Standard

Bluetooth V5.0

Host Interface

UART

Antenna Reference

Small antennas with 0~2 dBi peak gain

Frequency Band

2402 MHz ~ 2480 MHz

Number of Channels

79 channels

Modulation

GFSK, π/4-DQPSK,8DPSK

RF Specification

Output Power

Sensitivity @ BER=0.1%

for GFSK (1Mbps)

Sensitivity @ BER=0.01%

for π/4-DQPSK (2Mbps)

Sensitivity @ BER=0.01%

for 8DPSK (3Mbps)

Min.

2

Typical.

4

Max.

6

-70 dBm

-70 dBm

-70 dBm

Maximum Input Level

π/4-DQPSK (2Mbps): -20dBm

GFSK (1Mbps): -20dBm

8DPSK (3Mbps): -20dBm

Note: The RF specification will be updated in future version.

FN-LINK TECHNOLOGY LIMITED

7

Proprietary & Confidential Information

K255B-SR

4 Pin Assignments

4.1 Pin Outline

< TOP VIEW >

4.2 Pin Definition

NO

Name

Typ

1

2

3

4

GND

ANT0

GND

GND

e

－ Ground connections

I/O RF I/O port for BT

－ Ground connections

－ Ground connections

Description

Voltage

FN-LINK TECHNOLOGY LIMITED

8

Proprietary & Confidential Information

5

6

7

8

9

10

11

12

13

14

15

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

K255B-SR

ANT1/NC

－

Dual band Wi-Fi RF I/O for FGK255BSRX-00;

ANT2/NC

I/O

NC for FGK255BSRX-00

Dual band Wi-Fi RF I/O for FGK255BSRX-XM;

GND

GND

GND

GND

GND

GND

GND

NC

－ Ground connections

－ Ground connections

－ Ground connections

－ Ground connections

NC for FGK255BSRX-XM

－ Ground connections

－ Ground connections

－ Ground connections

－ No connect

CHIP_EN

low, default high

CHIP_EN

I

This pin can externally shut down WLAN function when pulled

16 WL_WAKE_HOST O WLAN wake-up HOST

SDIO_CMD

I/O SDIO command line

SDIO_ CLK

I/O SDIO clock line

SDIO_DATA_3

I/O SDIO data line 3

SDIO_DATA_2

I/O SDIO data line 2

SDIO_DATA_0

I/O SDIO data line 0

SDIO_DATA_1

GND

NC

NC

NC

PCM_SYNC

I/O SDIO data line 1

－ Ground connections

－ No connect

－ No connect

－ No connect

I/O PCM sync signal

PCM_IN

I PCM data input

PCM_OUT

O PCM Data output

PCM_CLK

I/O PCM clock

RTC_CLK

I

External Low Power Clock input (32.768KHz)

GND

NC

VDDIO

NC

If not used keep NC

－ Ground connections

－ No connect

P I/O Voltage supply input

－ No connect

FN-LINK TECHNOLOGY LIMITED

9

Proprietary & Confidential Information

1.8V

1.8V

1.8V

1.8V

1.8V

1.8V

1.8V

1.8V

1.8V

1.8V

1.8V

1.8V

1.8V

K255B-SR

3.3V

1.8V

1.8V

1.8V

1.8V

36

37

38

39

40

41

42

43

44

45

46

47

48

VCC33

NC

NC

GND

UART_TXD

P Main power voltage source input

－ No connect

－ No connect

－ Ground connections

O Bluetooth UART interface

UART_RXD

I Bluetooth UART interface

UART_RTS_N

O Bluetooth UART interface

UART_CTS_N

NC

NC

GND

GND

I Bluetooth UART interface

－ No connect

－ No connect

－ Ground connections

MUX Uart BT Print Out

If not used keep NC

－ Ground connections

ANT_SEL/NC

O

49 HOST_WAKE_BT

I

The function of this PIN will be updated in

1.8V

HOST wake-up Bluetooth device

future version

Bluetooth device to wake-up HOST

50 BT_WAKE_HOST O

The function of this PIN will be updated in

1.8V

P:POWER I:INPUT O:OUTPUT VDDIO:1.8V

future version

FN-LINK TECHNOLOGY LIMITED

10

Proprietary & Confidential Information

K255B-SR

5 Dimensions

5.1 Module Picture

L x W : 15 x 13 (+0.3/-0.1) mm

FGK255BSRX-XM:

FGK255BSRX-00:

H: 2.15 (±0.2) mm

5.2 Marking Description

Weight

0.81 (±0.1) g

FN-LINK TECHNOLOGY LIMITED

11

Proprietary & Confidential Information

5.3 Module Physical Dimensions

(Unit: mm)

< TOP VIEW >

6,5

K255B-SR

6,5

5,625

4,75

4,25

3,85

3,35

2,95

2,45

2,05

1,55

1,15

0,65

0,25

5

7

,

5

2

6

16

,

,

66

5

,

,

2

75

,

34

,

84

,

43

,

93

2

,

,

5

622

,

11

1

,

7

0

,

2

0

,

5

7

,

FN-LINK TECHNOLOGY LIMITED

12

Proprietary & Confidential Information

5.4 Layout Recommendation

(Unit: mm)

< TOP VIEW >

6,5

K255B-SR

6,75

6,5

5,625

4,75

4,25

3,85

3,35

2,95

2,45

2,05

1,55

1,15

0,65

0,25

5

7

,

7

5

,

7

5

2

6

16

,

,

66

5

,

,

2

75

,

34

,

84

3

,

,

4

93

2

,

,

5

622

,

11

1

,

7

,

0

2

,

0

5

,

7

FN-LINK TECHNOLOGY LIMITED

13

Proprietary & Confidential Information

6 Host Interface Timing Diagram

6.1 system power on sequence

K255B-SR

FN-LINK TECHNOLOGY LIMITED

14

Proprietary & Confidential Information

6.2 SDIO Pin Description

The module supports SDIO version 3.0 for all 1.8V to 3.3V.

K255B-SR

SDIO Pin Description

SD 4-Bit Mode

DATA0 Data Line 0

DATA1 Data Line 1 or Interrupt

DATA2 Data Line 2 or Read Wait

DATA3 Data Line 3

CLK

CMD

Clock

Command Line

6.3 SDIO Default Mode Timing Diagram

Parameter

Symbol Minimum Typical Maximum Unit

SDIO CLK(All values are referred to minimum VIH and maximum VILb)

Frequency - Data Transfer mode

Frequency - Identification mode

Clock low time

Clock high time

Clock rise time

Clock low time

Input setup time

Input hold time

Inputs:CMD, DAT(referenced to CLK)

fPP

fOD

tWL

tWH

tTLH

tTHL

tISU

tIH

0

0

10

10

-

-

5

5

-

-

-

-

-

-

-

-

25

400

10

10

-

-

-

-

MHz

kHz

ns

ns

ns

ns

ns

ns

FN-LINK TECHNOLOGY LIMITED

15

Proprietary & Confidential Information

Outputs:CMD, DAT(referenced to CLK)

Output delay time - Data Transfer mode

tODLY

Output delay time - Identification mode

tODLY

0

0

-

-

14

50

ns

ns

K255B-SR

a. Timing is based on CL ≤ 40 pF load on CMD and Data.

b. Min(Vih) = 0.7 × VDDIO and max(Vil) = 0.2 × VDDIO.

6.4 SDIO High Speed Mode Timing Diagram

Parameter

Symbol Minimum Typical Maximum Unit

SDIO CLK(all values are referred to minimum VIH and maximum VILb)

Frequency - Data Transfer mode

Frequency - Identification mode

Clock low time

Clock high time

Clock rise time

Clock low time

Input setup time

Input hold time

Inputs:CMD, DAT(referenced to CLK)

Outputs:CMD, DAT(referenced to CLK)

Output delay time - Data Transfer mode

tODLY

Output delay time - Identification mode

tODLY

2.5

Total system capacitance(each line)

CL

a.

Timing is based on CL ≤ 40 pF load on CMD and Data.

b. Min(Vih) = 0.7 × VDDIO and max(Vil) = 0.2 × VDDIO.

fPP

fOD

tWL

tWH

tTLH

tTHL

tISU

tIH

0

0

7

7

-

-

6

2

-

-

-

-

-

-

-

-

-

-

-

-

-

50

400

-

-

3

3

-

-

-

14

40

MHz

kHz

ns

ns

ns

ns

ns

ns

ns

ns

pF

FN-LINK TECHNOLOGY LIMITED

16

Proprietary & Confidential Information

6.5 SDIO Bus Timing Specifications in SDR Modes

K255B-SR

Clock timing(SDR Modes)

Parametwer Symbol

Minimum Maximum Unit

Comments

-

-

tCLK

40

20

10

4.8

-

-

-

-

-

tCR, tCF

0.2 × tCLK

tCR, tCF < 2.00 ns (max)@100 MHz,

ns

ns

ns

ns

ns

SDR12 mode

SDR25 mode

SDR50 mode

SDR104 mode

CCARD = 10 pF

CCARD = 10 pF

tCR, tCF < 0.96 ns (max)@208 MHz,

Clock duty

-

30

70

%

-

Card Input timing (SDR Modes)

Symbol

Minimum Maximum Unit

Comments

SDR104 Mode

SDR50 Mode

tIS

tIH

tIS

tIH

1.70a

0.80

3.00

0.80

-

-

-

-

a. SDIO 3.0 specification value is 1.40 ns.

ns

ns

ns

ns

CCARD = 10pF, VCT = 0.975V

CCARD = 5pF, VCT = 0.975V

CCARD = 10pF, VCT = 0.975V

CCARD = 5pF, VCT = 0.975V

FN-LINK TECHNOLOGY LIMITED

17

Proprietary & Confidential Information

Card output timing (SDR Modes up to 100MHz)

K255B-SR

Symbol Minimum Maximum Unit Comments

-

-

1.5

tODLY

tODLY

tOH

a.

SDIO 3.0 specification value is 7.5 ns.

7.85a

14.0

-

ns

ns

ns

tCLK≥10 ns CL=30 pF using driver type B for SDR50

tCLK≥20 ns CL=40 pF using for SDR12, SDR25

Hold time at the tODLY(min) CL=15 pF

Card output timing (SDR Modes 100MHz to 208MHz)

Symbol Minimum Maximum Unit Comments

tOP

△tOP

tODW

0

-350

0.6

2

-

UI

ps

UI

Card output phase

tODW = 2.88 ns @ 208 MHz

+1550

Delay variation due to temp change after tuning

FN-LINK TECHNOLOGY LIMITED

18

Proprietary & Confidential Information

 △tOP = +1550 ps for junction temperature of △tOP = 90 degrees during operation

 △tOP = -350 ps for junction temperature of △tOP = -20 degrees during operation

 △tOP = +2600 ps for junction temperature of △tOP = -20 to +125 degrees during operation

K255B-SR

6.6 SDIO Bus Timing Specifications in DDR50 Mode

parameter Symbol Minimum Maximum Unit

Comments

-

-

tCLK

tCR, tC

-

DDR50 mode

ns

ns

0.2 ×tCLK

tCR, tCF < 4.00 ns (max)@50 MHz,

Clock duty

-

55

%

-

CCARD = 10 pF

20

-

45

Data Timing

FN-LINK TECHNOLOGY LIMITED

19

Proprietary & Confidential Information

K255B-SR

Symbol Minimum Maximum Unit Comments

Output delay time

tODLY

13.7

CCARD < 30 pF (1 Card)

Output hold time

tOH

CCARD < 15 pF (1 Card)

parameter

Input CMD

Input setup time

Input hold time

Output CMD

Input DAT

Input setup time

Input hold time

Output CMD

tISU

tIH

tISU2x

tIH2x

6

0.8

-

1.5

3

0.8

Output delay time

tODLY2x

-

7.85a

Output hold time

tODLY2x

1.5

a.

SDIO 3.0 specification value is 7.0 ns

-

-

-

-

-

-

ns

ns

ns

ns

ns

ns

ns

ns

CCARD < 10 pF (1 Card)

CCARD < 10 pF (1 Card)

CCARD < 10 pF (1 Card)

CCARD < 10 pF (1 Card)

CCARD < 25 pF (1 Card)

CCARD < 15 pF (1 Card)

FN-LINK TECHNOLOGY LIMITED

20

Proprietary & Confidential Information

7 Reference Design

K255B-SR

Note: The function of PIN49 and PIN50 will be updated in future version.

FN-LINK TECHNOLOGY LIMITED

21

Proprietary & Confidential Information

K255B-SR

8 Ordering Information

Part No.

FGK255BSRX-XM

FGK255BSRX-00

Description

W155S1, a/b/g/n/ac, Wi-Fi, BT5.0, 1T1R, SDIO+UART, 2

Antenna version, 13x15mm(XIAOMI VERSION)

W155S1, a/b/g/n/ac, Wi-Fi, BT5.0, 1T1R, SDIO+UART, 2

Antenna version, 13x15mm(GENERAL VERSION)

9 The Key Material List

Item Part Name

Description

Manufacturer

Inductor

2016 2.2uH,±20%

Sunlord, Ceaiya, Cenker

Diplexer

1608 Dual-band, dual-mode

Glead, Walsin, ACX, Murata,

2.4GHz/5GHz WLAN

MAG.LAYERS

ECEC, TKD, Hosonic, JWT,

Crystal

2016 40MHz

Chipset

W155S1

PCB

FR4, 4 LAYER, GREEN

XY-PCB, GDKX, Sunlord,

1

2

3

4

5

TXC

Amlogic

SLPCB

FN-LINK TECHNOLOGY LIMITED

22

Proprietary & Confidential Information

K255B-SR

10 Recommended Reflow Profile

Referred to IPC/JEDEC standard.

Peak Temperature : 260°C

Number of Times : 2 times

FN-LINK TECHNOLOGY LIMITED

23

Proprietary & Confidential Information

K255B-SR

11 Package Information

11.1 Reel

A roll of 1500pcs

11.2 Carrier Tape Detail

FN-LINK TECHNOLOGY LIMITED

24

Proprietary & Confidential Information

11.3 Packaging Detail

K255B-SR

11.4 Moisture sensitivity

The Modules is a Moisture Sensitive Device level 3,

in according with standard

IPC/JEDEC J-STD-020, take care

all the relatives requirements for using this kind of components.

Moreover, the customer has to take care of the following conditions:

a) Calculated shelf life in sealed bag: 12 months at <40°C and <90% relative humidity

(RH).

b) Environmental condition during the production: 30°C / 60% RH according to

IPC/JEDEC J-STD-033A paragraph 5.

c) The maximum time between the opening of the sealed bag and the reflow process

must be 168 hours if condition

b) “IPC/JEDEC J-STD-033A paragraph 5.2” is respected

d) Baking is required if conditions b) or c) are not respected

e) Baking is required if the humidity indicator inside the bag indicates 10% RH or more

FN-LINK TECHNOLOGY LIMITED

25

Proprietary & Confidential Information



 

 

 

 

 

 

 

 

 

 

 

 

 

 

HUNAN FN-LINK TECHNOLOGY LIMITED

Agent Authorization

Company: HUNAN FN-LINK TECHNOLOGY LIMITED

Address: No. 8，Litong Road，Liuyang Economic Development Zone，Liuyang

City, Hunan Province, China

Product Name: WIFI+BT Module

Model Number(s): K255B-SR

Product Description: WIFI+BT Module K255B-SR

We authorize MiCOM Labs Inc., 575 Boulder Court, Pleasanton, California 94566, USA,

to act on our behalf on all matters concerning the certification of above named

equipment.

We declare that MiCOM Labs Inc. is allowed to forward all information related to the

approval and certification of equipment to the regulatory agencies as required and to

discuss any issues concerning the approval application. Any and all acts carried out by

MiCOM Labs on our behalf shall have the same effect as acts of our own.

Signature:

Date: 2021/07/15

Name:

Wayne Zou

Title:

Manager

Company: HUNAN FN-LINK TECHNOLOGY LIMITED



 

 

HUNAN FN-LINK TECHNOLOGY LIMITED Dear FCC We, HUNAN FN-LINK TECHNOLOGY LIMITED, are requesting for the dismissal of the following applications recently certified on 07/22/2021. FCC ID: 2AATL-K255B-SR TC Numbers: TC299889, TC787881, TC434690. The reason for the dismissal request of the above-mentioned applications is that incorrect modular type is chosen in the FCC ID granted, this applicant is requesting Limited Single Modular Approval, however Split Modular Approval is chosen accidentally, and accept this applicant. We confirm that the device under FCC ID: 2AATL-K255B-SR has never been marketed or sold anywhere in the United States or anywhere else in the world. Sincerely Thanks!

Name: joe huang Date: 07/30/2021 Title: maneger Signature of applicant:

 

 

HUNAN FN-LINK TECHNOLOGY LIMITED Federal Communications Commission Equipment Authorization Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2021-07-28 Subject; Modular Transmitter Application Company name: HUNAN FN-LINK TECHNOLOGY LIMITED FCC ID: 2AATL-K255B-SR Dear Sir/Madam, This letter includes the FCC application requirements for Modular Transmitter Approval Request for;-

FCC KDB 996369 D01 Module Certification Guide v02; and FCC KDB 996369 D03 OEM Manual v01 In accordance with 47CFR 15.212 Modular Transmitters and KDB 996369 D01 Module Equip Auth Guide v02. FCC ID: 2AATL-K255B-SR has been examined against the following requirements. Requirement per 15.212 and KDB 996369 D01 The radio elements must have the radio frequency circuitry shielded. Physical components and tuning capacitor(s) may be located external to the shield, but must be on the module assembly. The module must have buffered modulation/data inputs to ensure that the device will comply with Part 15 requirements with any type of input signal. The module must contain power supply regulation on the module. The module must contain a permanently attached antenna, or contain a unique antenna connector, and be marketed and operated only with specific antenna(s), per 15.203, 15.204(b), 15.204(c), 15.212(a), 2.929(b). The module must demonstrate compliance in a stand-alone configuration. The module must be labeled with its permanently affixed FCC ID label, or use an electronic display (see KDB Publication 784748). The module must comply with all specific rules applicable to the transmitter, including all the conditions provided in the integration instructions by the grantee. Explanation from Grantee Yes The product is produced with permanently attached RF shield during production. Yes The product buffers the modulation and data inputs ensuring compliance with regulations Yes The product incorporates regulators to ensure operation in specified range. No, Module without fixed antenna No This products need to be tested with auxiliary antennas and test fixtures Yes The product has required labeling placed on the module and instruction for placement on exterior of end product Yes The product fully complies with all specific applicable rules and regulatory precautions are addressed in manual FCC Modular Approval Request Rev 3.0 HUNAN FN-LINK TECHNOLOGY LIMITED The module must comply with RF exposure requirements Yes The product complies with applicable RF exposure requirements. Installation and RF exposure precautions are addressed in manual Date: July 28 2021 Name: Wayne Zou Title: Manager Signature of applicant FCC Modular Approval Request Rev 3.0

 

 

 

 

 

 

HUNAN FN-LINK TECHNOLOGY LIMITED

Office of Engineering Technology

Federal Communications Commission

7435 Oakland Mills Road

Columbia, MD 21046

USA

Date: 2021.07.15

Subject; Request for Confidentiality

FCC ID: 2AATL-K255B-SR

To Whom It May Concern,

Pursuant to the provisions of the Commission’s rules Title 47 Sections §0.457 and §0.459, we

are requesting the Commission to withhold the following attachment(s) as confidential

documents from public disclosure indefinitely.

These documents contain detailed system and equipment descriptions and are considered as

proprietary information in operation of the equipment. The public disclosure of these documents

might be harmful to our company and would give competitors an unfair advantage in the market.

Schematic Diagram

Block Diagram

Parts List

Operational Description

Tune-up Procedure

External Photos

Test Setup Photos

Internal Photos

User Manual

In additional to above mentioned documents, in order to comply with the marketing regulations

in Title 47 CFR §2.803 and the importation rules in Title 47 CFR §2.1204, while ensuring that

business sensitive information remains confidential until the actual marketing of newly

authorized devices, we request Short Term Confidentiality of the following attachment(s);

OR

For 45 days, pursuant to Public Notice DA 04-1705.

For 180 days pursuant to KDB 726920 D01.

It is our understanding that all measurement test reports, FCC ID label format and

correspondence during the certification review process cannot be granted as confidential

documents and this information will be available for public review once the grant of equipment

authorization is issued.

Sincerely,

Signature:

Name: Wayne Zou

Title: Manager



 

 

 

 

 

 

 

 

 

 

HUNAN FN-LINK TECHNOLOGY LIMITED

FCC Software Configuration Control Declaration

Date: July 19, 2021

Federal Communications Commission

7435 Oakland Mills Road

Columbia, MD 21046

USA

Attn: OET Dept.

Product/ Model Number: WIFI+BT Module / K255B-SR

Regarding FCC Country Code Selection guidelines identified in KDB 594280 D01 Configuration

Control v02r01.

“All applications for equipment authorization for transmitters that can have radio

parameters, or other technical parameters, reported to the Commission set by software

must have an attestation indicating that no third party will have software, or configuration

control, to program the device out of compliance of the technical rules under which it has

been certified.”

We declare that no third party will have software, or configuration control, to program the device

out of compliance of the technical rules under which it has been certified.

Name:

Title:

Signature of applicant

Date: July 19, 2021

Wayne Zou

Manager

K255B-SR_FCC Software Configuration Control Declaration Rev1.1.docx