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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
12
2
CINT
Integrator output. Integrator capacitor connection.
2
Not Used
VSS
Negative power supply input (TC500/TC500A only).
33
3
CAZ
Auto-zero input. The auto-zero capacitor connection.
4
BUF
Buffer output. The Integrator capacitor connection.
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
—
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).