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MCP2140 Datasheet(PDF) 5 Page - Microchip Technology |
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MCP2140 Datasheet(HTML) 5 Page - Microchip Technology |
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5 / 34 page  2004 Microchip Technology Inc. Preliminary DS21894B-page 5 MCP2122 2.0 DEVICE OPERATION The MCP2122 is a low-cost infrared encoder/decoder. The baud rate is the same for the host UART and IR interfaces and is determined by the frequency of the 16XCLK signal, with a maximum baud rate of 115.2 Kbaud. The MCP2122 is made up of these functional modules: • Clock Driver (16XCLK) • Reset • IR Encoder/Decoder - IrDA Standard Encoder - IrDA Standard Decoder The 16XCLK circuit allows a clock input to provide the device clock. The Reset circuit supports an external reset signal. The IR Encoder logic takes a data bit and converts it to the IrDA standard signal according to the IrDA standard Physical Layer specification, while the IR Decoder logic takes the IrDA standard signal and converts it to 8-bit data bytes. 2.1 Power-up As the device is powered up, there will be a voltage range in which the device will not operate properly. The device should be reset once it has entered the normal operating range (from an out-of-voltage condition). The RESET pin may then be forced high. Other device operating parameters (such as frequency, temperature, etc.) must also be within their operating ranges when the device exits reset. Otherwise, the device may not function as desired. 2.2 Device Reset The MCP2122 is forced into the known state (RESET) when the RESET pin is in the low state. Once the RESET pin is brought to a high state, the device begins normal operation (if the device operating parameters are met). Table 2-1 shows the states of the output pins while the device is in reset (RESET = Low). Table 2-2 shows the state of the output pins once the device exits reset, RESET = L →H (device in Normal Operation mode). The MCP2122 has a RESET noise filter in the RESET input signal path. The filter will detect and ignore small pulses. Using the RESET pin to enter a low-power state is discussed in Section 2.9 “Minimizing Power”. TABLE 2-1: DEFAULT OUTPUT PIN STATES IN DEVICE RESET TABLE 2-2: DEFAULT OUTPUT PIN STATES AFTER DEVICE RESET (RESET = L →H) 2.3 Decoupling It is highly recommended that the MCP2122 have a decoupling capacitor (CBYP). A 0.01 µF capacitor is recommended as a starting value, but an evaluation of the best value for your circuit/layout should be performed. Place this decoupling capacitor (CBYP) as close to the MCP2122 as possible (see Figure 2-1). FIGURE 2-1: DEVICE DECOUPLING Input Pin Output Pin State Comments Name State RX TXIR RESET L H L Device in Reset mode Input Pin Output Pin State Comments Name State RX TXIR TX L — L →H →L After 7 - 8 16XCLK pulses, the TXIR pin will pulse high. H— L RXIR L H →L — After 4 16XCLK pulses, RX = L. HH — VDD (bypass capacitor) MCP2122 VDD RESET VSS 16XCLK TX RX TXIR RXIR CBYP |
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Similar Description - MCP2140 |
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