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ADM1178
Data Sheet
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
MONITORING ACCURACY 1
Current Sense Absolute Accuracy
0°C to +70°C
0°C to +85°C
?40°C to +85°C
V SENSE for ADC Full Scale 2
?1.45
?1.8
?2.8
?5.7
?1.5
?1.8
?2.95
?6.1
?1.95
?2.45
?3.85
?6.7
105.84
+1.45
+1.8
+2.8
+5.7
+1.5
+1.8
+2.95
+6.1
+1.95
+2.45
+3.85
+6.7
%
%
%
%
%
%
%
%
%
%
%
%
mV
V SENSE = 75 mV
V SENSE = 50 mV
V SENSE = 25 mV
V SENSE = 12.5 mV
V SENSE = 75 mV
V SENSE = 50 mV
V SENSE = 25 mV
V SENSE = 12.5 mV
V SENSE = 75 mV
V SENSE = 50 mV
V SENSE = 25 mV
V SENSE = 12.5 mV
Voltage Sense Accuracy
0°C to +70°C
0°C to +85°C
?40°C to +85°C
?0.85
?0.9
?0.85
?0.9
?0.9
?1.15
+0.85
+0.9
+0.85
+0.9
+0.9
+1.15
%
%
%
%
%
%
V CC = 3 V minimum (low range)
V CC = 6 V minimum (high range)
V CC = 3 V minimum (low range)
V CC = 6 V minimum (high range)
V CC = 3 V minimum (low range)
V CC = 6 V minimum (high range)
V CC for ADC Full Scale 3
I C TIMING
2
Low Range (VRANGE = 1)
High Range (VRANGE = 0)
6.65
26.35
V
V
Low Level Input Voltage, V IL
High Level Input Voltage, V IH
Low Level Output Voltage on SDA, V OL
0.7 V BUS
0.3 V BUS
0.4
V
V
V
V BUS = 3.0 V to 5.5 V
V BUS = 3.0 V to 5.5 V
I OL = 3 mA
Output Fall Time on SDA from V IHMIN to V ILMAX
Maximum Width of Spikes Suppressed by
20 + 0.1 C BUS
50
250
250
ns
ns
C BUS = bus capacitance from SDA to GND
Input Filtering on SDA and SCL Pins
Input Current, I I , on SDA/SCL When Not
?10
+10
μA
Driving a Logic Low Output
Input Capacitance on SDA/SCL
SCL Clock Frequency, f SCL
Low Period of the SCL Clock
High Period of the SCL Clock
ADC Conversion Time 4
600
1300
5
150
400
pF
kHz
ns
ns
μs
Fast Overcurrent Response Time 5
Setup Time for a Repeated Start Condition, t SU;STA
SDA Output Data Hold Time, t HD;DAT
Setup Time for a Stop Condition, t SU;STO
Bus Free Time Between a Stop and a Start
600
100
600
1300
4
10
900
μs
ns
ns
ns
ns
Condition, t BUF
Capacitive Load for Each Bus Line
400
pF
1
2
3
4
5
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.
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
the Specifications for the Current Sense Absolute Accuracy parameter).
These are absolute values to be used when converting ADC codes to voltage readings; any inaccuracy in these values is factored into voltage accuracy values (see the
Specifications for the Voltage Sense Accuracy parameter).
Time between the receipt of the command byte and the actual ADC result being placed in the register.
Guaranteed by design; not production tested.
Rev. D | Page 4 of 24
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