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TC500ACJE Datasheet(PDF) 7 Page - Microchip Technology |
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TC500ACJE Datasheet(HTML) 7 Page - Microchip Technology |
7 / 38 page © 2008 Microchip Technology Inc. DS21428E-page 7 TC500/A/510/514 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE TC500, TC500A TC510 TC514 Symbol Function CERDIP, PDIP, SOIC PDIP, SOIC PDIP, SOIC 12 2 CINT Integrator output. Integrator capacitor connection. 2 Not Used Not Used VSS Negative power supply input (TC500/TC500A only). 33 3 CAZ Auto-zero input. The auto-zero capacitor connection. 4 4 4 BUF Buffer output. The Integrator capacitor connection. 5 5 5 ACOM This pin is grounded in most applications. It is recommended that ACOM and the input common pin (Ven- or CHn-) be within the analog Common Mode Range (CMR). 66 6 CREF- Input. Negative reference capacitor connection. 77 7 CREF+ Input. Positive reference capacitor connection. 88 8 VREF- Input. External voltage reference (-) connection. 99 9 VREF+ Input. External voltage reference (+) connection. 10 15 Not Used VIN- Negative analog input. 11 16 Not Used VIN+ Positive analog input. 12 18 22 A Input. Converter phase control MSB. (See input B.) 13 17 21 B Input. Converter phase control LSB. The states of A, B place the TC5XX in one of four required phases. A conversion is complete when all four phases have been executed: Phase control input pins: AB = 00: Integrator zero 01: Auto-zero 10: Integrate 11: De-integrate 14 19 23 CMPTR OUT Zero crossing comparator output. CMPTR is high during the integration phase when a positive input voltage is being integrated and is low when a negative input voltage is being integrated. A high- to-low transition on CMPTR signals the processor that the De- integrate phase is completed. CMPTR is undefined during the auto- zero phase. It should be monitored to time the integrator zero phase. 15 23 27 DGND Input. Digital ground. 16 21 25 VDD Input. Power supply positive connection. — 22 26 CAP+ Input. Negative power supply converter capacitor (+) connection. — 24 28 CAP- Input. Negative power supply converter capacitor (-) connection. —1 1 VOUT- Output. Negative power supply converter output and reservoir capacitor connection. This output can be used to power other devices in the circuit requiring a negative bias voltage. — 20 24 OSC Oscillator control input. The negative power supply converter normally runs at a frequency of 100 kHz. The converter oscillator frequency can be slowed down (to reduce quiescent current) by connecting an external capacitor between this pin and VDD (see Section 2.0 “Typical Performance Curves” ). — — 18 CH1+ Positive analog input pin. MUX channel 1. — — 13 CH1- Negative analog input pin. MUX channel 1. — — 17 CH2+ Positive analog input pin. MUX channel 2. — — 12 CH2- Negative analog input pin. MUX channel 2. — — 16 CH3+ Positive analog input pin. MUX channel 3. — — 11 CH3- Negative analog input pin. MUX channel 3. — — 15 CH4+ Positive analog input pin. MUX channel 4. — — 10 CH4- Negative analog input pin. MUX channel 4 — — 20 A0 Multiplexer input channel select input LSB (see A1). |
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