BQ28400PWR Datasheet, PDF (9/24 Pages) Texas Instruments – Tablet PC and Netbook 2-Series Cell Li-Ion Battery Gas Gauge and Protection

bq28400
www.ti.com
SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010
ELECTRICAL CHARACTERISTICS (continued)
Typical values stated where T_A = 25ºC and V_BAT = V_PACK = 7.2 V, Min/Max values stated where T_A = –20ºC to 85ºC and V_BAT
= V_PACK = 3.8 V to 18.75 V over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITION⁽¹⁾
MIN
TYP
MAX
UNIT
Pre-Charge/ZVCHG FET Drive
V_(PreCHGON)
V_O(PreCHGON) = V_(PACK)
–V_(ZVCHG), pre-charge
FET on ⁽⁸⁾
R_GS = 1 MΩ, V_PACK = 10 V
9
9.5
10
V
V_(PreCHGOFF)
Output voltage,
pre-charge FET off ⁽⁸⁾
R_GS = 1 MΩ, T_A = –20°C to 110°C
V_BAT –
0.5
V
t_r
t_f
SMBus
Rise time
Fall time
C_L = 4700 pF,
R_G = 5.1 kΩ
C_L = 4700 pF,
R_G = 5.1 kΩ
V_ZVCHG: 10% to
90%
V_ZVCHG: 90% to
10%
80
200
µs
1.7
ms
f_SMB
SMBus operating
frequency
Slave mode, SMBC 50% duty cycle
10
100
kHz
f_MAS
SMBus master clock
frequency
Master mode, no clock low slave extend
51.2
kHz
t_BUF
t_HD:STA
t_SU:STA
t_SU:STO
t_HD:DAT
Bus free time between start and stop
Hold time after (repeated) start
Repeated start setup time
Stop setup time
Data hold time
Receive mode
Transmit mode
4.7
µs
4
µs
4.7
µs
4
µs
0
ns
300
t_SU:DAT
t_TIMEOUT
t_LOW
t_HIGH
t_LOW:SEXT
Data setup time
Error signal/detect
Clock low period
Clock high period
Cumulative clock low
slave extend time
See ⁽⁹⁾
See ⁽¹⁰⁾
See ⁽¹¹⁾
250
ns
25
35
ms
4.7
µs
4
50
µs
25
ms
t_LOW:MEXT
t_f
t_r
Cumulative clock low
master extend time
Clock/data fall time
Clock/data rise time
See ⁽¹²⁾
See ⁽¹³⁾
See ⁽¹⁴⁾
10
ms
300
ns
1000
ns
(8) For a V_BAT or V_PACK input range of 3.8 V to 18.75 V, MIN V_O(FETON) voltage is 9 V or V_(BAT) – 1 V, whichever is less.
(9) The bq28400 times out when any clock low exceeds t_TIMEOUT.
(10) t_HIGH:MAX is the minimum bus idle time. SMBC = SMBD = 1 for t > 50 µs causes reset of any transaction involving bq28400 that is in
progress.
(11) t_LOW:SEXT is the cumulative time a slave device is allowed to extend the clock cycles in one message from initial start to the stop.
(12) t_LOW:MEXT is the cumulative time a master device is allowed to extend the clock cycles in one message from initial start to the stop.
(13) Rise time t_r = V_ILMAX – 0.15) to (V_IHMIN + 0.15).
(14) Fall time t_f = 0.9V_DD to (V_ILMAX – 0.15).
Copyright © 2010, Texas Instruments Incorporated
9
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