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RN41 Datasheet(PDF) 8 Page - Microchip Technology |
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RN41 Datasheet(HTML) 8 Page - Microchip Technology |
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8 / 28 page  RN41/RN41N DS50002280A-page 8 2014 Microchip Technology Inc. 2.0 APPLICATION INFORMATION The following sections provide information on design- ing with the RN41/RN41N module, including radio interference, factory reset, solder reflow profile, con- nection status, and so on. 2.1 Reset Circuit The RN41/RN41N 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 misconfigured. 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 RN41 and RN41N, respectively. When laying out the carrier board for the RN41 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 RN41 and RN41N, respec- tively. For optimal radio performance, the RN41 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 RN41 on the host PCB. FIGURE 2-1: RN41 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 GPIO5 Status Description High The module is connected to another device over Bluetooth. Low The module is not connected over Bluetooth. Host PCB Ground Plane Edge Shield Pads X4 0.8 mm x 1.3 mm Do not locate vias or signal traces under Shield Pads |
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Similar Description - RN41 |
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