Manual

DS2741
Current Monitor and Accumulator with
Integrated Sense Resistor
_______________________________________________________________________________________ 3
TEMPERATURE SENSOR CHARACTERISTICS
(V
CC
= +2.5V to +4.5V, T
A
= -20°C to +70°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Temperature Error ±5 °C
AC ELECTRICAL CHARACTERISTICS: I
2
C INTERFACE
(2.5V ≤ V
CC
≤ 4.5V, T
A
= -20°C to +70°C, timing referenced to V
IL(MAX)
and V
IH(MIN)
. See Figure 4.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SCL Clock Frequency f
SCL
(Note 5) 0 400 kHz
Bus Free Time Between STOP
and START Conditions
t
BUF
1.3 μs
Hold Time (Repeated) START
Condition
t
HD:STA
0.6 μs
Low Period of SCL t
LOW
1.3 μs
High Period of SCL t
HIGH
0.6 μs
Data Hold Time t
HD:DAT
0 0.9 μs
Data Setup Time t
SU:DAT
100 ns
START Setup Time t
SU:STA
0.6 μs
SDA and SCL Rise Time t
R
(Note 6)
20 +
0.1C
B
300 ns
SDA and SCL Fall Time t
F
(Note 6)
20 +
0.1C
B
300 ns
STOP Setup Time t
SU:STO
0.6 μs
SDA and SCL Capacitive
Loading
C
B
(Note 6) 400 pF
Note 1: All voltages are referenced to GND. Currents entering the IC are specified positive and currents exiting the IC are negative.
Note 2: Compensation of the internal sense resistor value for initial tolerance and temperature coefficient of -20°C to +70°C can
reduce the maximum reportable magnitude to 2.5A.
Note 3: Current sampling ceases for 2.5ms every 144ms to allow the ADC to measure temperature.
Note 4: Typical value for t
ERR1
is specified at 3.6V and +25°C, max value is specified for 0°C to +50°C. Max value for t
ERR2
is
specified for -20°C to +70°C.
Note 5: Interface timing shown is for fast-mode (400kHz) operation. This device is also backward compatible with standard-mode
I
2
C timing.
Note 6: C
B
—Total capacitance of one bus line in pF; timing referenced to 0.1 x V
CC
and 0.9 x V
CC
.