Datasheet

LTC2941
3
2941fb
For more information www.linear.com/LTC2941
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Requirements
V
SENSE
+
Supply Voltage 2.7 5.5 V
I
SUPPLY
Supply Current (Note 3) Device On
l
70 100 µA
Shutdown
l
2.5 µA
Shutdown, V
SENSE
+
≤ 4.2V 1 µA
V
UVLO
Undervoltage Lockout Threshold V
SENSE
+
Falling, DCB Package
V
SENSE
+
Falling, MSE Package
l
l
2.5
2.45
2.6
2.6
2.7
2.7
V
V
Coulomb Counter
V
SENSE
Sense Voltage Differential Input Range V
SENSE
+
– V
SENSE
–
l
±50 mV
Differential Input Resistance, Across
SENSE
+
and SENSE
–
(Note 7)
400 kΩ
q
LSB
Charge LSB (Note 4) Prescaler M = 128 (Default),
R
SENSE
= 50mΩ
0.085 mAh
TCE Total Charge Error (Note 5) 10mV ≤ |V
SENSE
| ≤ 50mV DC ±1 %
10mV ≤ |V
SENSE
| ≤ 50mV, DC V
SENSE
+
≤ 4.2V
l
±1.5 %
1mV ≤ |V
SENSE
| ≤ 50mV DC (Note 7)
l
±3.5 %
V
BAT
Alert V
BAT
Alert Threshold V
SENSE
+
Falling, B[7:6] = 01
l
2.75 2.8 2.85 V
V
SENSE
+
Falling, B[7:6] = 10
l
2.85 2.9 2.95 V
V
SENSE
+
Falling, B[7:6] = 11
l
2.95 3 3.05 V
Digital Inputs and Digital Outputs
V
ITH
Logic Input Threshold, AL/CC, SCL,
SDA
l
0.3 •
V
SENSE
+
0.7 •
V
SENSE
+
V
V
OL
Low Level Output Voltage, AL/CC, SDA I = 3mA
l
0.4 V
I
IN
Input Leakage, AL/CC, SCL, SDA V
IN
= V
SENSE
+
/2
l
1 µA
C
IN
Input Capacitance, AL/CC, SCL, SDA (Note 7)
l
10 pF
t
PCC
Minimum Charge Complete (CC) Pulse
Width
1 µs
I
2
C Timing Characteristics
f
SCL(MAX)
Maximum SCL Clock Frequency
l
400 900 kHz
t
BUF(MIN)
Bus Free Time Between STOP/START
l
1.3 µs
t
SU,STA(MIN)
Minimum Repeated START Set-Up
Time
l
600 ns
t
HD,STA(MIN)
Minimum Hold Time (Repeated)
START Condition
l
600 ns
t
SU,STO(MIN)
Minimum Set-Up Time for STOP
Condition
l
600 ns