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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP402XEV датащи(PDF) 13 Page - Microchip Technology |
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MCP402XEV датащи(HTML) 13 Page - Microchip Technology |
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13 / 46 page  Installation and Operation © 2005 Microchip Technology Inc. DS51546B-page 9 2.2.3 Evaluating the MCP4023 and MCP4013 The MCP4023/13-XXXI/OT is a 6-pin, grounded digital potentiometer with terminals A and W available on the device pins. Footprint U2 supports the SOT-23-6 package. Populating R2 will create a voltage divider with a transfer function illustrated in Equation 2-2. EQUATION 2-2: GROUNDED POTENTIOMETER – VOLTAGE DIVIDER CALCULATION 2.2.4 Evaluating the MCP4024 and MCP4014 The MCP4024/14-xxxI/OT is a 5-pin, grounded digital rheostat with the W terminals available on the device pins. Footprint U2 supports the SOT-23-5 package. An “INCR” command moves the wiper toward terminal A, thus causing the resistance across the rheostat to increase. A “DECR” command moves the wiper toward terminal B, thus causing the resistance across the rheostat to decrease. V wiper V DD R wb ⋅ R2 R nom + -------------------------- 5.0V d 10k ⋅ 63 ⁄ () ⋅ 2.5k 10k + ----------------------------------------------- = = Where: d = the wiper setting (0 to 63) Note 1: DO NOT populate U1 if using U2. 2: The included MCP4021 digital potentiometer samples could be used to evaluate the MCP4023 simply by shorting terminal B to GND. 3: The MCP4013 has high-voltage tolerant pins and, therefore, accepts high-voltage Increment and Decrement commands. Since this device is nonvolatile, the WiperLock™ Technology feature is not present. Note 1: DO NOT populate U1 if using U2. 2: The included MCP4021 digital potentiometer samples could be used to evaluate the MCP4024 simply by not populating R2, letting terminal A float and by shorting terminal B to GND. 3: The MCP4014 has high-voltage tolerant pins and, therefore, accepts high-voltage Increment and Decrement commands. Since this device is nonvolatile, the WiperLock™ Technology feature is not present. |
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