Datasheet RN4870, RN4871 (Microchip) - 8

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RN4870/71 1.2 Module Configuration
Table 1-5 shows the status of the module as indicated by the Status 1 and Status 2 indication pins. Table 1-6 The GPIO pins of the RN4870 and RN4871 modules shows the details of test pads that are present on the can be configured to different functions using the ASCII bottom side of the module, used for diagnostic command interface. Table 1-3 shows the various pins purposes during testing. Figure 1-5 shows al the key in the RN4870/71 module that are available for elements of the module. configuration and their default configuration settings. Table 1-4 provides details on each available function.
TABLE 1-3: CONFIGURABLE PINS AND DEFAULT FUNCTIONS IN THE RN4870 AND RN4871 Available in Pin Name Default Function RN4870 RN4871
P0_7 x — Low Battery Indication P1_0 x — Status 2 P1_1 x — Status 1 P2_2 x — None P2_4 x — None P3_1 x — RSSI Indication P3_2 x — Link Drop P3_3 x — UART RX Indication P3_4 x — Pairing Key P3_5 x — None P1_2 x x None P1_3 x x None P1_6 — x UART RX Indication P1_7 — x None
TABLE 1-4: CONFIGURABLE FUNCTIONS AND DESCRIPTIONS Function Name Description
Low Battery Indication Pin output goes low when the VDD is below a specified level. To set the threshold level, change the EEPROM settings. Status 1 Use this indication pin along with the Status 2 pin to indicate the current status of the module. Refer to Table 1-5 for details of the status indication. Status 2 Use this indication pin along with the Status 1 pin to indicate the current status of the module. Refer to Table 1-5 for details of the status indication. RSSI Indication Use this indication pin to indicate the quality of the link based on the RSSI level. If the RSSI level is lower than the specified threshold value, then the RSSI indication pin goes low. Set the threshold for the RSSI link quality in EEPROM. Link Drop When the RN4870/71 is connected to a remote device, the host MCU can use the Link Drop pin to force the module to disconnect the link and enter Shutdown state. The pin needs to be pulled low for at least 10 ms. UART RX Indication Use this pin to enable communication with the UART when the module is in Low- Power mode. When not in Low-Power mode, the module runs on a 16 MHz clock. If Low-Power mode is enabled on the module by using command SO,1, the module runs on a 32 kHz clock thus reducing power consumption. However, in Low-Power mode, the host MCU cannot communicate with the module via the UART since the UART is not operational. If the user intends to provide data or commands via UART in the Low-Power mode, then the UART RX INDICATION pin must be pulled low and the user needs to wait for at least five milliseconds before sending the data. Pulling the UART RX INDICATION pin low allows the module to operate the 16 MHz clock and to enable UART. DS50002489D-page 8  2016-2019 Microchip Technology Inc. Document Outline Bluetooth® Low Energy Module 1.0 Device Overview 1.1 Overview TABLE 1-1: RN4870/71 Family TABLE 1-2: PIN Description FIGURE 1-1: PIN Diagram - RN4870U FIGURE 1-2: PIN Diagram - RN4870 FIGURE 1-3: PIN Diagram - RN4871U FIGURE 1-4: PIN Diagram - RN4871 1.2 Module Configuration TABLE 1-3: Configurable pins and default functions in the RN4870 and RN4871 TABLE 1-4: Configurable functions and descriptions TABLE 1-5: Status Indication PINs TABLE 1-6: Test points on the bottom side FIGURE 1-5: Block Diagram of the RN4870/71 2.0 Specifications TABLE 2-1: General Specifications TABLE 2-2: Electrical characteristics TABLE 2-3: Current consumption TABLE 2-4: Current consumption during application mode 3.0 Interface PINs FIGURE 3-1: Power Scheme FIGURE 3-2: RN4870/71 Coin cell power scheme 4.0 Physical Dimensions And Attributes 4.1 RN4870 Module FIGURE 4-1: RN4870 module dimensions FIGURE 4-2: RN4870 Recommended PCB footprint FIGURE 4-3: Recommended mounting details 4.2 RN4870U Module FIGURE 4-4: RN4870U module dimensions FIGURE 4-5: RN4870U recommended PCB footprint FIGURE 4-6: RN4870U Recommended PCB mounting 4.3 RN4871 Module FIGURE 4-7: RN4871 module dimensions FIGURE 4-8: RN4871 recommended PCB footprint FIGURE 4-9: RN4871 Recommended PCB mounting suggestion 4.4 RN4871U Module FIGURE 4-10: RN4871U module dimensions FIGURE 4-11: RN4871U recommended PCB footprint FIGURE 4-12: RN4871U Recommended PCB mounting FIGURE 4-13: Recommendations for the placement of the module on the Host PCB board 4.5 Soldering Recommendations 5.0 Application Reference Circuits 5.1 External Configuration and Programming 5.2 Reference Circuit FIGURE 5-1: External programming header configurations FIGURE 5-2: RN4870 reference circuit FIGURE 5-3: RN4870U reference circuit FIGURE 5-4: RN4871 Reference circuit FIGURE 5-5: RN4871U reference circuit 5.3 Power Drop Protection FIGURE 5-6: Power Drop protection circuit 6.0 ASCII Command API 7.0 Supported Services 8.0 Antenna Characteristics FIGURE 8-1: RN4870 Antenna performance FIGURE 8-2: RN4871 Antenna performance 9.0 Timing Characteristics FIGURE 9-1: Timing diagram of RN4870/71 UART ready after reset (in test and application mode) FIGURE 9-2: Timing diagram of RN4870/71 UART when powered on (in test and application mode) TABLE 9-1: Error rate for various baud rates on the RN4870/71 10.0 Regulatory Approval 10.1 United States 10.1.1 Labeling and User Information Requirements 10.1.2 RF Exposure 10.1.3 HELPFUL WEB SITES 10.2 Canada 10.2.1 Labeling and User Information Requirements 10.2.2 RF Exposure 10.2.3 Helpful Web Sites 10.3 Europe 10.3.1 LABELING AND USER INFORMATION REQUIREMENTS 10.3.2 CONFORMITY ASSESSMENT 10.3.3 Helpful web sites 10.4 Japan 10.4.1 LABELING AND USER INFORMATION REQUIREMENTS 10.4.2 HELPFUL WEB SITES 10.5 Korea 10.5.1 LABELING AND USER INFORMATION REQUIREMENTS 10.5.2 HELPFUL WEB SITES 10.6 Taiwan 10.6.1 LABELING AND USER INFORMATION REQUIREMENTS 10.6.2 HELPFUL WEB SITES 10.7 China 10.7.1 LABELING AND USER INFORMATION REQUIREMENTS 10.8 Other Regulatory Jurisdictions 10.9 Other Regulatory Information 11.0 Ordering Information TABLE 11-1: Ordering information Appendix A: Revision History The Microchip WebSite Customer Change Notification Service Customer Support AMERICAS Corporate Office Atlanta Austin, TX Boston Chicago Dallas Detroit Houston, TX Indianapolis Los Angeles Raleigh, NC New York, NY San Jose, CA Canada - Toronto ASIA/PACIFIC Australia - Sydney China - Beijing China - Chengdu China - Chongqing China - Dongguan China - Guangzhou China - Hangzhou China - Hong Kong SAR China - Nanjing China - Qingdao China - Shanghai China - Shenyang China - Shenzhen China - Suzhou China - Wuhan China - Xian China - Xiamen China - Zhuhai ASIA/PACIFIC India - Bangalore India - New Delhi India - Pune Japan - Osaka Japan - Tokyo Korea - Daegu Korea - Seoul Malaysia - Kuala Lumpur Malaysia - Penang Philippines - Manila Singapore Taiwan - Hsin Chu Taiwan - Kaohsiung Taiwan - Taipei Thailand - Bangkok Vietnam - Ho Chi Minh EUROPE Austria - Wels Denmark - Copenhagen Finland - Espoo France - Paris Germany - Garching Germany - Haan Germany - Heilbronn Germany - Karlsruhe Germany - Munich Germany - Rosenheim Israel - Ra’anana Italy - Milan Italy - Padova Netherlands - Drunen Norway - Trondheim Poland - Warsaw Romania - Bucharest Spain - Madrid Sweden - Gothenberg Sweden - Stockholm UK - Wokingham Worldwide Sales and Service Trademarks Worldwide Sales and Service