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MCP4641 数据表(PDF) 40 Page - Microchip Technology |
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MCP4641 数据表(HTML) 40 Page - Microchip Technology |
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40 / 102 page  MCP453X/455X/463X/465X DS22096B-page 40 2008-2013 Microchip Technology Inc. 5.2 Wiper Each tap point (between the RS resistors) is a connection point for an analog switch. The opposite side of the analog switch is connected to a common signal, which is connected to the Terminal W (Wiper) pin. A value in the Volatile Wiper register selects which analog switch to close, connecting the W terminal to the selected node of the resistor ladder. The wiper can connect directly to Terminal B or to Terminal A. A zero-scale connection, connects the Ter- minal W (wiper) to Terminal B (wiper setting of 000h). A full-scale connection, connects the Terminal W (wiper) to Terminal A (wiper setting of 100h or 80h). In these configurations, the only resistance between Terminal W and the other Terminal (A or B) is that of the analog switches. A wiper setting value greater than full-scale (wiper setting of 100h for 8-bit device or 80h for 7-bit devices) will also be a Full-Scale setting (Terminal W (wiper) connected to Terminal A). Table 5-1 illustrates the full wiper setting map. Equation 5-2 illustrates the calculation used to deter- mine the resistance between the wiper and terminal B. EQUATION 5-2: RWB CALCULATION TABLE 5-1: VOLATILE WIPER VALUE VS. WIPER POSITION MAP A POR/BOR event will load the Volatile Wiper register value with the default value. Table 5-2 shows the default values offered. Custom POR/BOR options are available. Contact the local Microchip Sales Office. R WB R ABN 256 --------------R W + = N = 0 to 256 (decimal) R WB R ABN 128 --------------R W + = N = 0 to 128 (decimal) 8-bit Device 7-bit Device Wiper Setting Properties 7-bit Pot 8-bit Pot 3FFh 081h 3FFh 101h Reserved (Full-Scale (W = A)), Increment and Decrement commands ignored 080h 100h Full-Scale (W = A), Increment commands ignored 07Fh 041h 0FFh 081 W = N 040h 080h W = N (Mid-Scale) 03Fh 001h 07Fh 001 W = N 000h 000h Zero Scale (W = B) Decrement command ignored TABLE 5-2: DEFAULT FACTORY SETTINGS SELECTION Wiper Code 8-bit 7-bit -502 5.0 k Mid-scale 80h 40h -103 10.0 k Mid-scale 80h 40h -503 50.0 k Mid-scale 80h 40h -104 100.0 k Mid-scale 80h 40h |
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