Rainbow Electronics DS2778 - Manual (Page 3)

DS2775/DS2776/DS2777/DS2778
2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with
Protector and Optional SHA-1 Authentication
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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