Datasheet
© 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 2C
INT
Integrator output. Integrator capacitor connection.
2 Not Used Not Used V
SS
Negative power supply input (TC500/TC500A only).
33 3C
AZ
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 (Ve
n
- or
CH
n
-) be within the analog
Common Mode Range (CMR).
66 6C
REF
- Input. Negative reference capacitor connection.
77 7C
REF
+ Input. Positive reference capacitor connection.
88 8V
REF
- Input. External voltage reference (-) connection.
99 9V
REF
+ Input. External voltage reference (+) connection.
10 15 Not Used V
IN
- Negative analog input.
11 16 Not Used V
IN
+ 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 V
DD
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 1V
OUT
- 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 V
DD
(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).