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BQ77908 Datasheet(PDF) 9 Page - Texas Instruments

Part # BQ77908
Description  Stand-Alone Multi-Cell Lithium-Ion/Polymer Precision Protectors
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

BQ77908 Datasheet(HTML) 9 Page - Texas Instruments

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t
su(BUF)
bq77908
www.ti.com
SLUSAI5D
– APRIL 2011 – REVISED NOVEMBER 2011
ELECTRICAL CHARACTERISTICS (continued)
Vcell(n) = 1.4 to 4.375 for all cells, TA = –25°C to 85ºC, BAT = 5.6 to 35 V; Typical values stated where TA = 25°C and BAT =
28.8 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
CHARGER DETECTION
(11)
Voltage at CHGST pin,
referenced to VSS, to determine
VCHG_DET1
charger present (charger
5.6 V
< BAT < 35 V
0.3
0.5
0.7
V
insertion detected when voltage
at CHGST pin
> VCHG_DET1)
LOAD REMOVAL DETECTION
Voltage at DPCKN, referenced
to VSS, with DSG FET disabled
VOPEN_LOAD
to detect load removal (load
5.6 V
< BAT < 35 V
1.5
2
2.5
V
removal detected when voltage
at DPCKN
< VOPEN_LOAD)
Internal resistance between
RDSG_GND
5.6 V
< BAT < 35 V
1000
1500
3000
k
Ω
DPCKN and VSS
EEPROM LIFETIME
TDR
Data retention
5.6 V
< BAT < 35 V
10
years
(11) Alternate charger detection options are available using the CPCKN pin. Contact TI for additional configuration versions.
SERIAL COMMUNICATION INTERFACE (for Configuration Only)
BAT = 5.6 V to 35 V, TA = –25°C to 85°C
PARAMETER
MIN
MAX
UNIT
tr
SCLK, SDATA
 rise time
1000
ns
tf
SCLK, SDATA
 fall time
300
ns
tw(H)
SCLK pulse duration, high
8
µs
tw(L)
SCLK pulse duration, low
10
µs
tsu(STA)
Setup time for START condition
9.4
µs
th(STA)
START condition hold time after which first clock pulse is generated
8
µs
tsu(DAT)
Data setup time
250
ns
th(DAT)
Data hold time
0
µs
tsu(STOP)
Setup time for STOP condition
8
µs
tsu(BUF)
Time the bus must be free before new transmission can start
9.4
µs
tV
Clock low to data out valid
900
ns
th(CH)
Data out hold time after clock low
0
ns
fSCL
Clock frequency
0
50
kHz
Copyright
© 2011, Texas Instruments Incorporated
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