Electrical characteristics (continued), Electrical characteristics: protection circuit – Rainbow Electronics DS2778 User Manual
Page 3
DS2775/DS2776/DS2777/DS2778
2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with
Protector and Optional SHA-1 Authentication
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +4.0V to +9.2V, T
A
= -20°C to +70°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DQ, PIO, SDA Output Logic-Low
V
OL
I
OL
= 4mA
0.4
V
DQ, PIO Pullup Current
I
PU
Sleep mode, V
PIN
= (V
DD
- 0.4V)
30
100
200
nA
DQ, PIO, SDA, SCL Pulldown
Current
I
PD
Active mode, V
PIN
= 0.4V
30
100
200
nA
DQ Input Capacitance
C
DQ
50 pF
DQ Sleep Timeout
t
SLEEP
DQ < V
IL
2 9 s
PIO, DQ Wake Debounce
t
WDB
Sleep mode
100
ms
SHA-1 COMPUTATION TIMING (DS2776/DS2778 ONLY)
(V
DD
= +4.0V to +9.2V, T
A
= 0°C to +70°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Computation Time
t
COMP
30
ms
ELECTRICAL CHARACTERISTICS: PROTECTION CIRCUIT
(V
DD
= +4.0V to +9.2V, T
A
= 0°C to +50°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
OV
= 1110111b
4.438
4.473
4.508
Overvoltage Detect
V
OV
V
OV
= 1100011b
4.242
4.277
4.312
V
Charge-Enable Voltage
V
CE
Relative to V
OV
-100 mV
Undervoltage Detect
V
UV
Programmable in Control register 0x60h,
UV[1:0] = 10
2.415 2.450 2.485
V
OC = 11b
-60
-75
-90
Overcurrent Detect: Charge
V
COC
OC = 00b
-12.5
-25
-38
mV
OC = 11b
80
100
120
Overcurrent Detect: Discharge
V
DOC
OC = 00b
25
38
50
mV
SC
=1b
240 300 360
Short-Circuit Current Detect
V
SC
SC = 0b
120
150
180
mV
Overvoltage Delay
t
OVD
(Note 3)
600
1400
ms
Undervoltage Delay
t
UVD
(Note 3)
600
1400
ms
Overcurrent Delay
t
OCD
8
10
12
ms
Short-Circuit Delay
t
SCD
80
120
160
μs
Charger-Detect Hysteresis
V
CD
V
UV
condition
50 mV
Test Threshold
V
TP
COC, DOC condition
0.4
1.0
1.2
V
DOC
condition
20 40 80
Test Current
I
TST
COC
condition
-45 -60 -95
μA
PLS Pulldown Current
I
PPD
Sleep
mode
200 400 630 μA
Recovery Current
I
RC
V
UV
condition, max: V
PLS
= 15V, V
DD
= 1.4V;
min: V
PLS
= 4.2V, V
DD
= 2V
3.3 8 13 mA