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MCP2150 bảng dữ liệu(PDF) 7 Page - Microchip Technology |
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MCP2150 bảng dữ liệu(HTML) 7 Page - Microchip Technology |
7 / 52 page 2001-2012 Microchip Technology Inc. Preliminary DS21655C-page 7 MCP2150 2.0 DEVICE OPERATION The MCP2150 is a cost effective, low pin count (18- pin), easy to use device for implementing IrDA stan- dard wireless connectivity. The MCP2150 provides support for the IrDA standard protocol “stack” plus bit encoding/decoding. The Serial interface and IR baud rates are independantly selectable. 2.1 Power Up Any time the device is powered up (parameter D003), the Power Up Timer delay (parameter 33) occurs, fol- lowed by an Oscillator Start-up Timer (OST) delay (parameter 32). Once these delays complete, commu- nication with the device may be initiated. This commu- nication is from both the infrared transceiver’s side as well as the controller’s UART interface. 2.2 Device Reset The MCP2150 is forced into the reset state when the RESET pin is in the low state. Once the RESET pin is brought to a high state, the Device Reset sequence occurs. Once the sequence completes, functional operation begins. 2.3 Clock Source The MCP2150 requires a clock source to operate. The frequency of this clock is 11.0592 MHz (electrical spec- ification parameter 1A). This clock can be supplied by either a crystal/resonator or as an external clock input. 2.3.1 CRYSTAL OSCILLATOR / CERAMIC RESONATORS A crystal or ceramic resonator can be connected to the OSC1 and OSC2 pins to establish oscillation (Figure 2-1). The MCP2150 oscillator design requires the use of a parallel cut crystal. Use of a series cut crys- tal may give a frequency outside of the crystal manufacturers specifications. FIGURE 2-1: CRYSTAL OPERATION (OR CERAMIC RESONATOR) TABLE 2-1: CAPACITOR SELECTION FOR CERAMIC RESONATORS TABLE 2-2: CAPACITOR SELECTION FOR CRYSTAL OSCILLATOR 2.3.2 EXTERNAL CLOCK IN For applications where a clock is already available elsewhere, users may directly drive the MCP2150 pro- vided that this external clock source meets the AC/DC timing requirements listed in Section 4.3. Figure 2-2 shows how an external clock circuit should be configured. FIGURE 2-2: EXTERNAL CLOCK INPUT OPERATION See Table 2-1 and Table 2-2 for recommended values of C1 and C2. Note: A series resistor may be required for AT strip cut crystals. C1 C2 XTAL OSC2 RS OSC1 RF To internal MCP2150 Note logic Freq OSC1 (C1) OSC2 (C2) 11.0592 MHz 10 - 22 pF 10 - 22 pF Higher capacitance increases the stability of the oscil- lator but also increases the start-up time. These val- ues are for design guidance only. Since each resonator has its own characteristics, the user should consult the resonator manufacturer for appropriate values of external components. Freq OSC1 (C1) OSC2 (C2) 11.0592 MHz 15 - 30 pF 15 - 30 pF Higher capacitance increases the stability of the oscil- lator but also increases the start-up time. These val- ues are for design guidance only. RS may be required to avoid overdriving crystals with low drive level spec- ification. Since each crystal has its own characteristics, the user should consult the crystal manufacturer for appropriate values of external components. Clock From external MCP2150 OSC1 OSC2 Open system 21655C.book Page 7 Thursday, January 10, 2013 12:57 PM |
Số phần tương tự - MCP2150_13 |
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Mô tả tương tự - MCP2150_13 |
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