Datasheet RN4870, RN4871 (Microchip) - 27
| Manufacturer | Microchip |
| Description | Bluetooth Low Energy Module |
| Pages / Page | 51 / 27 — RN4870/71. FIGURE 5-4:. RN4871 REFERENCE CIRCUIT. FIGURE 5-5:. RN4871U … |
| File Format / Size | PDF / 2.2 Mb |
| Document Language | English |
RN4870/71. FIGURE 5-4:. RN4871 REFERENCE CIRCUIT. FIGURE 5-5:. RN4871U REFERENCE CIRCUIT. 5.3. Power Drop Protection
Model Line for this Datasheet
Text Version of Document
link to page 28
RN4870/71 FIGURE 5-4: RN4871 REFERENCE CIRCUIT
Configuration Interface Reverse Voltage Protection P2_0 J2 U1 Q1 Power Input 1 VCC RN4871 VCC STS2301 J1 2 3 1 1 3 UART_RX 1 NC P2_0 16 P2_0 2 4 UART_TX 2 C1 GND P2_7 15 P2_7 5 P1_3 3 P1_2 VBAT 14 2 P1_2 4 X P1_3 GND 13 GND P1_7 5 T_R T_TX P1_7 P0_2 T P0_2 12 GND GND GND GND P1_6 UAR UAR P3_6 RS P0_0 UART Interface GND 10uF 6.3V X5R 6 7 8 9 10 11 VCC X LED Option X VCC Reset Circuit _R _T 6 U2 RT RT 6 0 LD1 VCC R1 P1_ UA UA P3_ P0_ MCP112 R2 1 B P0_2 4.7k VDD 3 VOUT 330 RST VSS Configurable I/O C2 2 P0_0 P1_7 1uF P2_0 MODE P0_2 P2_0 P1_2 P2_7 Low Test Mode P1_3 P3_6 GND GND P1_6 High APP Mode
FIGURE 5-5: RN4871U REFERENCE CIRCUIT
VCC Reset Circuit VCC Configuration Interface P2_0 MODE 3 P2_0 VDD VOUT 1 J2 R2 Low Test Mode VSS 2 0 6 VCC 1 4.7k 2 U2 P0_ P0_ P3_ 2 High APP Mode MCP112 RST UART_RX 3 UART_TX 4 C2 9 8 7 6 5 5 1uF GND UART_RX UART_TX _2 _0 T _6 Reverse Voltage Protection P0 P0 RS P3 _RX UART Interface GND Power Input GND RT Q1 10 A BK_I UUART_TX 4 J1 STS2301 VCC 11 U1 VBAT P1_3 3 P1_3 1 1 3 12 RN4871U GND P1_2 2 P1_2 2 13 P1_6 BT_RF 1 C1 ANT1 2 Antenna Matching GND P1_7 P2_7 P2_0 GND L1 GND GND GND P1_6 1nH 14 15 16 17 10uF 6.3V X5R C3 C4 _7 _7 _0 Configurable I/O P1 P2 P2 GND P0_0 P1_7 VCC LED Option GND GND P0_2 P2_0 P1_2 P2_7 LD1 R1 P1_3 P3_6 B P0_2 P1_6 330
5.3 Power Drop Protection
power supply. Figure 5-6 shows a recommended power drop protection circuit. To prevent any problems that may arise when the power supply goes below 1.9V, a power-supply drop- protection circuit is recommended. Essential y, this circuit consists of a Reset IC which acts as an Open Drain with a Delay =< 10 ms, and is triggered at 1.8V 2016-2019 Microchip Technology Inc. DS50002489D-page 27 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
RN4870/71 FIGURE 5-4: RN4871 REFERENCE CIRCUIT
Configuration Interface Reverse Voltage Protection P2_0 J2 U1 Q1 Power Input 1 VCC RN4871 VCC STS2301 J1 2 3 1 1 3 UART_RX 1 NC P2_0 16 P2_0 2 4 UART_TX 2 C1 GND P2_7 15 P2_7 5 P1_3 3 P1_2 VBAT 14 2 P1_2 4 X P1_3 GND 13 GND P1_7 5 T_R T_TX P1_7 P0_2 T P0_2 12 GND GND GND GND P1_6 UAR UAR P3_6 RS P0_0 UART Interface GND 10uF 6.3V X5R 6 7 8 9 10 11 VCC X LED Option X VCC Reset Circuit _R _T 6 U2 RT RT 6 0 LD1 VCC R1 P1_ UA UA P3_ P0_ MCP112 R2 1 B P0_2 4.7k VDD 3 VOUT 330 RST VSS Configurable I/O C2 2 P0_0 P1_7 1uF P2_0 MODE P0_2 P2_0 P1_2 P2_7 Low Test Mode P1_3 P3_6 GND GND P1_6 High APP Mode
FIGURE 5-5: RN4871U REFERENCE CIRCUIT
VCC Reset Circuit VCC Configuration Interface P2_0 MODE 3 P2_0 VDD VOUT 1 J2 R2 Low Test Mode VSS 2 0 6 VCC 1 4.7k 2 U2 P0_ P0_ P3_ 2 High APP Mode MCP112 RST UART_RX 3 UART_TX 4 C2 9 8 7 6 5 5 1uF GND UART_RX UART_TX _2 _0 T _6 Reverse Voltage Protection P0 P0 RS P3 _RX UART Interface GND Power Input GND RT Q1 10 A BK_I UUART_TX 4 J1 STS2301 VCC 11 U1 VBAT P1_3 3 P1_3 1 1 3 12 RN4871U GND P1_2 2 P1_2 2 13 P1_6 BT_RF 1 C1 ANT1 2 Antenna Matching GND P1_7 P2_7 P2_0 GND L1 GND GND GND P1_6 1nH 14 15 16 17 10uF 6.3V X5R C3 C4 _7 _7 _0 Configurable I/O P1 P2 P2 GND P0_0 P1_7 VCC LED Option GND GND P0_2 P2_0 P1_2 P2_7 LD1 R1 P1_3 P3_6 B P0_2 P1_6 330
5.3 Power Drop Protection
power supply. Figure 5-6 shows a recommended power drop protection circuit. To prevent any problems that may arise when the power supply goes below 1.9V, a power-supply drop- protection circuit is recommended. Essential y, this circuit consists of a Reset IC which acts as an Open Drain with a Delay =< 10 ms, and is triggered at 1.8V 2016-2019 Microchip Technology Inc. DS50002489D-page 27 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