2ANZ-1127941BT | Module Integration Module Integration This document describes how to integrate the TI WL1831MOD radio module into a final product with a chip Antenna in a SISO system. The WL1831MOD is a surface mount Bluetooth and Wi-Fi combo radio module in the WL18XX family from Texas Instruments. The module data sheet can be found at the manufacturers web site below:
http://www.ti.com/wireless-connectivity/simplelink-solutions/wi-fi/products.html The module is shown below, along with the transmission line connecting it to the matching network and chip antenna. The module connects back to the host through multiple interfaces. All of these interfaces operate at a nominal supply voltage of 1.8V. The pin assignments of these signals are showing in Table 1 and Figure 1. DC Input Power:
The radio module power is regulated internally by the module. Power is applied to the VBAT_IN terminals with a voltage in the range of 2.9-4.8V. The I/O voltage of the module is set by applying 1.8V to the VIO_IN Terminal. Slow Clock:
The radio requires a 32.768 kHz square wave input at the EXT_32K input terminal of the module. Bluetooth UART:
The Bluetooth subsystem is controlled via an HCI 4-wire UART interface operating at 1.8V. Respironics Inc. (Philips Respironics) 1001 Murry Ridge Lane Murrysville PA 15668 Bluetooth PCM:
2ANZ-1127941BT | Module Integration The Bluetooth PCM can be used for BT Audio and can operate in either a master or slave configuration. If they are not used they should be not connected. (NC) WLAN Host Interface The WLAN interfaces uses a 4-bit SDIO Interface back to the host operating at 1.8V. The host must provide PU using a 10-K resistor for all non-CLK SDIO signals. In order to follow the wakeup/shutdown requirements, the WL_EN (pin number 40) should be connected to host GPIO. Must be pulled high for WLAN operation. This GPIO should have internal pull-
up allowing the WL18xx pin to remain high on host suspend. In order to enable WOW feature, a pull up on the line is required during HOST shutdown. IRQ_WL should be connected to host GPIO. This GPIO should be able to wake the host from suspend, therefore it's better to always connect the pin (number 14) to the always on domain of the Host. The IRQ_WL pin serves as interrupt generation from WL18xx to the host. Table 1: Device Pinout Pin #
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Function Signal GND NC NC NC NC WL_SDIO_CMD_1V8 WLAN SDIO Command GND Reserved for future use, NC Reserved for future use, NC Reserved for future use, NC Reserved for future use, NC WLAN CDIO CLK, must be driven by host WL_SDIO_CLK GND WL_SDIO_CMD_1V8 WLAN SDIO data bit 0 WLAN SDIO data bit 1 WL_SDIO_D1_1V8 WL_SDIO_D2_1V8 WLAN SDIO data bit 2 WLAN SDIO data bit 3 WL_SDIO_D3_1V8 WLAN SDIO IRQ WL_IRQ_1V8 GND GND GND RF_ANT2 NC if not used GND GND Pin #
33 34 35 36 37 38 39 Signal GND GND GND EXT_32K GND VIO_IN GND Function Input clock of 32.768 kHz Sets I/O voltage. 40 41 42 43 44 45 46 47 48 49 50 51 52 WLAN_EN BT_EN WL_UART_DBG BT_UART_DBG GND GND VBAT_IN VBAT_IN GND GND BT_HCI_RTS_1V8 BT_HCI_CTS_1V8 BT_HCI_TX_1V8 Hi = Enable Hi = Enable Used for Debug Used for Debug Power Supply Input: 2.9-4.8V Power Supply Input: 2.9-4.8V UART RTS to Host UART CTS to Host UART TX to Host Respironics Inc. (Philips Respironics) 1001 Murry Ridge Lane Murrysville PA 15668 21 22 23 24 25 26 27 28 29 30 31 32 NC NC GND GND NC GPIO2 GPIO1 GND GND GND GND RF_ANT1 2ANZ-1127941BT | Module Integration Reserved for future use, NC Reserved for future use, NC Reserved for future use, NC Used for Debug Used for Debug RF Antenna Connection 53 54 55 56 57 58 59 60 61 62 63 64 BT_HCI_RX_1V8 GND GND BT_AUD_IN BT_AUD_OUT BT_AUD_FSYNC GND BT_AUD_CLK GND NC GND GND UART RX to Host BT Audio, NC if not used BT Audio, NC if not used BT Audio, NC if not used BT Audio, NC if not used Reserved for future use, NC Respironics Inc. (Philips Respironics) 1001 Murry Ridge Lane Murrysville PA 15668 2ANZ-1127941BT | Module Integration Figure 1: Device Pinout. Figure 2: Host Connections Respironics Inc. (Philips Respironics) 1001 Murry Ridge Lane Murrysville PA 15668 2ANZ-1127941BT | Module Integration Antenna Connection:
The antenna is connected to terminal RF_ANT1 on the radio module. The connection between the antenna and RF_ANT1 should be made with a 50 ohm transmission line. A matching network will be needed to match the antenna and should be placed right before the antenna input. Avoid routing any analog or digital signals on the signal layer directly underneath any of the radio, matching network or antenna. All of the ground pins on the module must be connected to the main PCB. This device is intended only for OEM integrators under the following conditions:
The antenna must be installed so that 20 cm is maintained between the antenna and users. The transmitter module cannot be co-located with any other transmitter or antenna. The radio transmitter can operate only using a chip antenna with a maximum gain of 2.2dBi. Labeling If the FCC identification number is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module. This exterior label can use wording such as the following: Contains Transmitter Module FCC ID: 2AN9Z-1127941BT or Contains 2AN9Z-1127941BT. Any similar wording that expresses the same meaning may be used. Respironics Inc. (Philips Respironics) 1001 Murry Ridge Lane Murrysville PA 15668 2ANZ-1127941BT | Regulatory Compliance Regulatory Compliance 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. 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, TV reception, or other devices which can be determined by turning the equipment on and off, the user is encouraged to try to correct the interference by one or more of the following measures:
Reorient or relocate the receiving antenna (on the radio, TV, or other device). 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 of the device for help. Any changes or modifications made to the device that are not expressly approved by Respironics may void the users authority to operate the equipment. This device is intended only for OEM integrators under the following conditions:
The antenna must be installed so that 20 cm is maintained between the antenna and users. The transmitter module cannot be co-located with any other transmitter or antenna. The radio transmitter can operate only using a chip antenna with a maximum gain of 2.2dBi. Respironics Inc. (Philips Respironics) 1001 Murry Ridge Lane Murrysville PA 15668