 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
RN42NU Datasheet(PDF) 7 Page - Microchip Technology |
|
||||||||||||||||||||||||||||||
RN42NU Datasheet(HTML) 7 Page - Microchip Technology |
|
|
7 / 26 page  2015 Microchip Technology Inc. DS50002328A-page 7 RN42/RN42N 2.0 APPLICATION INFORMATION The following sections provide information on design- ing with the RN42/RN42N module, including radio interference, factory reset, solder reflow profile, con- nection status, and so on. 2.1 Reset Circuit The RN42/RN42N contains a weak internal pull-up to VCC, and the reset polarity is active low. The module’s reset pin has an optional Power-on Reset circuit with a delay, which should only be required if the input power supply has a very slow ramp or tends to bounce or have instability on power-up. Often a microcontroller or embedded CPU I/O is available to generate the reset once power is stable. If not, designers can use one of the many low-cost power supervisor chips available, such as the MCP809 or MCP102/121. 2.2 Factory Reset Using GPIO4 It is recommended to connect the GPIO4 pin to a switch, jumper, or resistor so it can be accessed. This pin can be used to reset the module to its factory default settings, which is critical in situations where the module has been misconfigure d. To reset the module to the factory defaults, GPIO4 should be high on power-up and then toggle between low and high twice with a 1 second wait between the low-high transitions. 2.3 Connection Status GPIO5 is available to drive an LED, and it blinks at var- ious speeds to indicate status, see Table 2-1. GPIO2 is an output that directly reflects the connection state as shown in Table 2-2. 2.4 Module Mounting Details Figure 2-1 and Figure 2-2 show the recommended PCB footprint for the RN42 and RN42N, respectively. When laying out the carrier board for the RN42 module, the areas under the antenna and shielding connections should not have surface traces, ground planes, or exposed vias. Figure 2-3 and Figure 2-4 show the recommended mounting details for the RN42 and RN42N, respec- tively. For optimal radio performance, the RN42 mod- ule’s antenna end should protrude at least 31 mm beyond any metal enclosure. Figure 2-5 shows examples of good, bad, and accept- able positioning of the RN42/RN42N on the host PCB. FIGURE 2-1: RN42 RECOMMENDED PCB FOOTPRINT TABLE 2-1: GPIO5 STATUS GPIO5 Status Description Toggle at 1 Hz The module is discoverable and waiting for a connection. Toggle at 10 Hz The module is in command mode. High The module is connected to another device over Bluetooth. TABLE 2-2: GPIO2 STATUS GPIO2 Status Description High The module is connected to another device over Bluetooth. Low The module is not connected over Bluetooth. 0.70mm 0.80mm 2.00mm 0.0 0.7 2.8 4.0 5.2 6.4 7.6 8.8 10.0 11.2 12.4 13.6 14.8 16.0 25.8 19.7 Shield Pads 4 Corners 1.0 x 1.8mm 20.5 Do not locate vias or surface traces under Shield Pads Top View Dimensions are in millimeters |
Similar Part No. - RN42NU |
|
Similar Description - RN42NU |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
