ADM1177

Data Sheet

Rev. C | Page 4 of 24

Parameter

Min

Typ

Max

Unit

Conditions

MONITORING ACCURACY1

Current Sense Absolute Accuracy

0°C to +70°C

−1.45

+1.45

%

−1.8

+1.8

%

−2.8

+2.8

%

−5.7

+5.7

%

0°C to +85°C

−1.5

+1.5

%

−1.8

+1.8

%

−2.95

+2.95

%

−6.1

+6.1

%

−40°C to +85°C

−1.95

+1.95

%

−2.45

+2.45

%

−3.85

+3.85

%

−6.7

+6.7

%

105.84

mV

Voltage Sense Accuracy

0°C to +70°C

−0.85

+0.85

%

−0.9

+0.9

%

0°C to +85°C

−0.85

+0.85

%

−0.9

+0.9

%

−40°C to +85°C

−0.9

+0.9

%

−1.15

+1.15

%

Low Range (VRANGE = 1)

6.65

V

High Range (VRANGE = 0)

26.35

V

V

V

0.4

V

250

ns

Maximum Width of Spikes Suppressed by Input

Filtering on SDA and SCL Pins

50

250

ns

Driving a Logic Low Output

−10

+10

µA

Input Capacitance on SDA/SCL

5

pF

400

kHz

Low Period of the SCL Clock

600

ns

High Period of the SCL Clock

1300

ns

600

ns

100

900

ns

ADC Conversion Time4

150

µs

4

10

µs

600

ns

Bus Free Time Between a Stop and a Start

1300

ns

Capacitive Load for Each Bus Line

400

pF

1

Monitoring accuracy is a measure of the error in a code that is read back for a particular voltage/current. This is a combination of amplifier error, reference error, ADC

error, and error in ADC full-scale code conversion factor.

2

This is an absolute value to be used when converting ADC codes to current readings; any inaccuracy in this value is factored into absolute current accuracy values (see

specifications for Current Sense Absolute Accuracy).

3

These are absolute values to be used when converting ADC codes to voltage readings; any inaccuracy in these values are factored into voltage accuracy values (see

specifications for Voltage Sense Accuracy).

4

Time between the receipt of the command byte and the actual ADC result being placed in the register.

5

Guaranteed by design; not production tested.