USER MANUAL The information contained herein is the exclusive property of ZK and shall not be distribwritten permission of ZK Version Date2022.8.31 MODEL NAME: ZK-7921,ZK-7921AU-TV,ZK-7921US, ZK-7921-M2AE,ZK-7921-DG,ZK-7921-DGX, ZK-7921-PC PRODUCT NAME : WiFi 6 communication module DESIGN Diao Pengjun CHECK APPROVAL REG.DATE :2022.8.31 REV.DATE :2022.8.31 S P E C I F I C A T I O N MODEL NAME:ZK-7921 DOCUMENT No :
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version Modify a record Date of update 1. Features ZK-7921 is the small size and low power module for IEEE 802.11a/b/g/n/ac/axwirelessLAN. ZK-7921 is based on MT7921AUN solution.IEEE802.11a/b/g/n/ac/axDual Band WLAN infrastructure Size : 100.3mmx 50.5mmx 11.5mm 2.4GHz&5GHZ &BT5.2 Support 1024QAM Support 2*2 MU-MIMO,OFDMA Rate up to 1774.5Mbps Operation mode STA,AP,P2P USB2.0*1 Supports drivers for Windows/Linux/Android Security:WPA3,WPA2,WPS2.0,WAPI,WEP,T KIP,CKIP,AES,GCMP,SMS4 Application: DTV, DVR, HD DVD Player, Blue-ray Disk Player, STB This equipment could be used on a laptop device, computer, TV and set-top box, but it needs to be installed and operated with minimum distance 20cm between the radiator & your body. 2. Ordering Information Model ZK-7921 Description Wi-Fi6 , 2T2R 3. Absolute Maximum Ratings Caution : The specifications in Table 1 define levels at which permanent damage to the device can occur. Function operation is not guaranteed under these conditions. Operating at absolute maximum conditions for extend periods can adversely affect the long-term reliability of the device. Parameter Storage Temperature Storage Humidity (40) Min
-10
Max
+70 90 Unit
< Table 1 Absolute Maximum Ratings > . Other conditions 1) Do not use or store modules in the corrosive atmosphere, especially where chloride gas, sulfide gas, acid, alkali, salt or the like are contained. Also, avoid exposure to moisture. 2) Store the modules where the temperature and relative humidity do not exceed 5 to 40 and 20 to 60%. 3) Assemble the modules within 6 months. Check the soldering ability in case of 6 months over. REG.DATE 2022.8.31 REV.DATE :2022.8.31 S P E C I F I C A T I O N MODEL NAME : ZK-7921 REV.NO :
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4. Operating Conditions Parameter Operating Temperature Operating Humidity Supply Voltage1 VDD Min
-10
Typ Max Unit 70 90
5.0
V 5.Standard Test Conditions The Test for electrical specification shall be performed under the following condition unless otherwise specified. 1). Ambient condition Temperature :25 5
. Humidity:65% 5% R.H. 2). Power supply voltages 3.3V (5%) input power at the Module 3). Current consumption over recommended range of supply voltage and operating conditions is like below. When its tested, it must be supplied more than 2 times of maximal current. REG.DATE :2022.8.31 REV.DATE :2022.8.31 S P E C I F I C A T I O N MODEL NAME : ZK-7921 REV.NO :
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6. Electrical Specifications 1) DC Characteristics Current Consumption Min. Typ. Max. Unit peak TX Mode ( MCS7) Idle and Associated state Radio disabled state
1A 340 160 20
mA 2) RF Characteristics for IEEE802.11b ( 11Mbps mode unless otherwise specified) Items Specification Mode Channel frequency Data rate TX Characteristics Power Level Spectrum Mask 1st side lobes ( to fc 11MHz) 2nd side lobes ( to fc 22MHz) Modulation Accuracy (EVM) Power On/Off ramp Freq. Tolerance Chip Clock Freq. Tolerance RX Characteristics Minimum Input Level Sens (FER 8%) Maximum Input Level (FER 8%)
* Normal Condition : 25, VDD=3.3. Contents IEEE802.11b DSSS/CCK 2400 ~ 2483 MHz 1,2,5.5,11Mbps Min. 15 Typ. 17 Max. 19 Unit dBm
-15
-15 Min.
-10
-43
-58 30 0.5
Typ.
-86
-30
-50 30 2.0 15 15 Max.
-76
dBr dBr
Usec ppm ppm Unit dBm dBm REG.DATE :2022.8.31 REV.DATE :2022.8.31 S P E C I F I C A T I O N MODEL NAME : ZK-7921 DOCUMENT No :
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3) RF Characteristics for IEEE802.11g ( 54Mbps mode unless otherwise specified) Items Specification Mode Contents IEEE802.11g OFDM Channel frequency 2400 ~ 2483 MHz Data rate 6,9,12,18,24,36,48,54Mbps TX Characteristics Min. Typ. Max. Unit Power Level Spectrum Mask at fc 11MHz at fc 20MHz at fc 30MHz Constellation Error (EVM) Freq. Tolerance Chip Clock Freq. Tolerance 13 15 17
-15
-15
-32
-43
-48
-34
-20
-28
-40
-28 15 15 dBm dBr dBr dBr dB ppm ppm RX Characteristics Min. Typ. Max. Unit Minimum Input Level Sens. (PER 10%) Maximum Input Level (PER 10%)
*Normal Condition : 25, VDD=3.3
-20
-75
dBm dBm REG.DATE :2022.8.31 REV.DATE :2022.8.31 S P E C I F I C A T I O N MODEL NAME : ZK-7921 REV.NO :
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4) RF Characteristics for IEEE802.11n ( MCS7 mode unless otherwise specified) Items Specification Mode Contents IEEE802.11n HT20/40 Channel frequency 2400 ~ 2483 MHz Data rate 6.5,13,19.5,26,39,52,58.5,65,13.5,2 7,40.5,54,81,108,121.5,135Mbps TX Characteristics Min. Typ. Max. Unit Power Level Spectrum Mask at fc 11MHz at fc 20MHz at fc 30MHz Constellation Error (EVM) Freq. Tolerance Chip Clock Freq. Tolerance 12 14 16 dBm
-15
-15
-32
-43
-48
-35
-20
-28
-40
-29 15 15 dBr dBr dBr dB ppm ppm RX Characteristics Min. Typ. Max. Unit Minimum Input Level Sens.(HT20,PER 10%) -
Minimum Input Level Sens.(HT40,PER 10%) -
-73
-70 Maximum Input Level (PER 10%)
-20
-66
-63
dBm dBm dBm REG.DATE :2022.8.31 REV.DATE :2022.8.31 S P E C I F I C A T I O N MODEL NAME : ZK-7921 DOCUMENT No :
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5) RF Characteristics for IEEE802.11a ( 54Mbps mode unless otherwise specified) Items Specification Mode Channel frequency Data rate Contents IEEE802.11a - 5GHz OFDM 5150~5650MHz, 5725 ~ 5850 MHz 6,9,12,18,24,36,48,54Mbps TX Characteristics Min. Typ. Max. Unit Power Level Spectrum Mask at fc 11MHz at fc 20MHz at fc 30MHz Constellation Error (EVM) Freq. Tolerance Chip Clock Freq. Tolerance 13 15 17 dBm
-15
-15
-32
-35
-45
-35
-20
-28
-40
-28 15 15 dBr dBr dBr dB ppm ppm RX Characteristics Min. Typ. Max. Unit Minimum Input Level Sens. (PER 10%) Maximum Input Level (PER 10%)
-30
-75
-68 dBm
dBm REG.DATE :2022.8.31 REV.DATE :2022.8.31 S P E C I F I C A T I O N MODEL NAME : ZK-7921 DOCUMENT No :
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6) RF Characteristics for IEEE802.11n ( MCS7 mode unless otherwise specified) Items Specification Mode Channel frequency Data rate Contents IEEE802.11n - 5GHz 11N HT20/40 5150~5650MHz, 5725 ~ 5850 MHz MCS0~MCS7 TX Characteristics Min. Typ. Max. Unit Power Level Spectrum Mask at fc 11MHz at fc 20MHz at fc 30MHz Constellation Error (EVM) Freq. Tolerance Chip Clock Freq. Tolerance 12 14 16 dBm
-15
-15
-32
-35
-45
-35
-20
-28
-40
-29 15 15 dBr dBr dBr dB ppm ppm RX Characteristics Min. Typ. Max. Unit Minimum Input Level Sens.(HT20,PER 10%) -
Minimum Input Level Sens.(HT40,PER 10%) -
-76
-73 Maximum Input Level (PER 10%)
-30
-64
-61
dBm dBm dBm REG.DATE :2022.8.31 REV.DATE :2022.8.31 S P E C I F I C A T I O N MODEL NAME : ZK-7921 7) RF Characteristics for IEEE802.11ac Items Specification Mode Channel frequency Data rate DOCUMENT No :
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Contents IEEE802.11ac - 5GHz HT80 5150~5650MHz,5180~5825 MHz,5725 ~ 5850 MHz MCS0~MCS11 TX Characteristics Min. Typ. Max. Unit Power Level Spectrum Mask at fc 11MHz at fc 20MHz at fc 30MHz Constellation Error (EVM) Freq. Tolerance Chip Clock Freq. Tolerance 11 13 15 dBm
-15
-15
-32
-35
-45
-35
-20
-28
-40
-29 15 15 dBr dBr dBr dB ppm ppm RX Characteristics Min. Typ. Max. Unit Minimum Input Level Sens.(HT80,PER 10%) -
-68
-61 dBm Maximum Input Level (PER 10%)
-30
dBm REG.DATE :2022.8.31 REV.DATE :2022.8.31 S P E C I F I C A T I O N MODEL NAME : ZK-7921 8) RF Characteristics for IEEE802.11ax Items Specification Mode Channel frequency Data rate DOCUMENT No :
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Contents IEEE802.11ax - 5GHz HT80 5150~5650MHz,5180~5825 MHz,5725 ~ 5850 MHz MCS0~MCS11 TX Characteristics Min. Typ. Max. Unit Power Level Spectrum Mask at fc 11MHz at fc 20MHz at fc 30MHz Constellation Error (EVM) Freq. Tolerance Chip Clock Freq. Tolerance 11 13 15 dBm
-15
-15
-32
-35
-45
-35
-20
-28
-40
-29 15 15 dBr dBr dBr dB ppm ppm RX Characteristics Min. Typ. Max. Unit Minimum Input Level Sens.(HT80,PER 10%) -
-67
-61 dBm Maximum Input Level (PER 10%)
-30
dBm REG.DATE :2022.8.31 REV.DATE :2022.8.31 S P E C I F I C A T I O N MODEL NAME : ZK-7921 DOCUMENT No :
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7.Bluetooth Specification Bluetooth Specification Conditions : VBAT=3.3V ; Temp:25C Feature Description General Specification Bluetooth Standard Bluetooth 5.2 BLE Host Interface USB /SDIO/UART Antenna Reference Small antennas with 0~2 dBi peak gain Frequency Band 2.400 GHz ~ 2483.5 GHz Number of Channels 80 channels Modulation FHSS, GFSK, DPSK, DQPSK RF Specification Output Power (Class 1.5) Output Power (Class 2) Sensitivity @ BER=0.1%
for GFSK (1Mbps) Sensitivity @ BER=0.01%
for /4-DQPSK (2Mbps) Sensitivity @ BER=0.01%
for 8DPSK (3Mbps) Maximum Input Level Min. Typical. Max. 10 2
-86
-86
-80 GFSK (1Mbps):-20dBm
/4-DQPSK (2Mbps) :-20dBm 8DPSK (3Mbps) :-20dBm 34.5mm 16.0mm
.0mm 2 m 2.5m 457 5mm 17.5mm 3.5mm 12.0.3mm 3.8mm 10.0mm 7.5mm 6.2mm 12.0m m 15.8mm
. 1 0 0 3 m m 3.15mm 2.0mm 3.15mm 2.5mm 10.0mm 7.5mm 3.8mm 40mm 20mm 50.5mm 11.0mm 11.5mm The device supports BT and WIFI functions. It is in conformity with the relevant Union harmonization legislation: Radio Equipment directive: 2014/53/EU. 5G Wifi alerts and restricted country codes The device is restricted to indoor use only when operating in the 5150 to 5350 MHz frequency range. This equipment complies with CE radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance of 20 cm between the radiator and your body. CE mark Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may cause undesired operation. Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
-Reorient or relocate the receiving antenna.
-Increase the separation between the equipment and receiver.
-Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
-Consult the dealer or an experienced radio/TV technician for help. This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body.