© 2002 Microchip Technology Inc.

DS21476B-page 5

TC820

Zero Reading Drift

—

—

—

—

—0.2

——

0°C

—1

—

—

-40°C

≤ T

Scale Factor Temperature

Coefficient

——

—

—

—1

5

ppm/°C

0°C

—

5

—

ppm/°C

-40°C

Ext Ref = 0ppm/°C

Supply Current

—

1

1.5

mA

Peak-to-Peak Backplane

Drive Voltage

4.25

4.7

5.3

V

Buzzer Frequency

—

5

—

kHz

Counter TIme-Base Period

—

1

—

Second

Low Battery Flag Voltage

6.7

7

7.3

V

Input Low Voltage

—

—

DGND + 1.5

V

Input High Voltage

—

—

V

Output Low Voltage,

UR, OR Outputs

—

DGND + 0.4

V

Control Pin Pull-down Current

—

5

—

µAV

TC820 ELECTRICAL SPECIFICATIONS (CONTINUED)

Symbol

Parameter

Min

Typ

Max

Units

Test Conditions

Note

1:

Input voltages may exceed the supply voltages provided that input current is limited to ±100

µA. Current above this value

may result in invalid display readings, but will not destroy the device if limited to ±1mA.

2:

Dissipation ratings assume device is mounted with all leads soldered to printed circuit board.