4

Pin Descriptions

PIN

SYMBOL

DESCRIPTION

1

GND

Digital Ground, 0V. Ground return for all digital logic.

2

STATUS

Output High during integrate and deintegrate until data is latched. Output Low when analog section

is in Auto-Zero configuration.

3

POL

Polarity - HI for positive input.

Three-State Output Data Bits

4

OR

Overrange - HI if overranged.

Three-State Output Data Bits

5

B12

Bit 12

(Most Significant Bit)

Three-State Output Data Bits

6

B11

Bit 11

High = True

Three-State Output Data Bits

7

B10

Bit 10

High = True

Three-State Output Data Bits

8

B9

Bit 9

High = True

Three-State Output Data Bits

9

B8

Bit 8

High = True

Three-State Output Data Bits

10

B7

Bit 7

High = True

Three-State Output Data Bits

11

B6

Bit 6

High = True

Three-State Output Data Bits

12

B5

Bit 5

High = True

Three-State Output Data Bits

13

B4

Bit 4

High = True

Three-State Output Data Bits

14

B3

Bit 3

High = True

Three-State Output Data Bits

15

B2

Bit 2

High = True

Three-State Output Data Bits

16

B1

Bit 1

(Least Significant Bit)

Three-State Output Data Bits

17

TEST

Input High - Normal Operation. Input Low - Forces all bit outputs high. Note: This input is used for

test purposes only. Tie high if not used.

18

LBEN

Low Byte Enable - With Mode (Pin 21) low, and CE/LOAD (Pin 20) low, taking this pin low activates

low order byte outputs B1 through B8.

With Mode (Pin 21) high, this pin serves as a low byte flag output used in handshake mode.

See Figures 7, 8, 9.

19

HBEN

High Byte Enable - With Mode (Pin 21) low, and CE/LOAD (Pin 20) low, taking this pin low activates

high order byte outputs B9 through B12, POL, OR.

With Mode (Pin 21) high, this pin serves as a high byte flag output used in handshake mode.

See Figures 7, 8, 9.

20

CE/LOAD

Chip Enable Load - With Mode (Pin 21) low. CE/LOAD serves as a master output enable. When

high, B1 through B12, POL, OR outputs are disabled.

With Mode (Pin 21) high, this pin serves as a load strobe used in handshake mode.

See Figures 7, 8, 9.

21

MODE

Input Low - Direct output mode where CE/LOAD (Pin 20), HBEN (Pin 19) and LBEN (Pin 18) act as

inputs directly controlling byte outputs.

Input Pulsed High - Causes immediate entry into handshake mode and output of data as in Figure 9.

Input High - Enables CE/LOAD (Pin 20), HBEN (Pin 19), and LBEN (Pin 18) as outputs, handshake

mode will be entered and data output as in Figures 7 and 8 at conversion completion.

22

OSC IN

Oscillator Input

23

OSC OUT

Oscillator Output

ICL7109