BQ24721 Datasheet, PDF (40/48 Pages) Texas Instruments – ADVANCED MULTI-CHEMISTRY AND MULTI-CELL SYNCHRONOUS SWITCH-MODE CHARGER AND SYSTEM POWER SELECTOR

bq24721
SLUS683 – NOVEMBER 2005
ELECTRICAL CHARACTERISTICS
7 Vdc ≤ V_(VCC) ≤ 24 Vdc, –20°C < T_J < 125°C, ref = AGND (unless otherwise noted).
PARAMETER
SMBus TIMING CHARACTERISTICS
t_R
SCLK/SDATA rise time
t_F
SCLK/SDATA fall time
t_W(H)
SCLK pulse width high
t_W(L)
SCLK Pulse Width Low
t_SU(STA)
Setup time for START condition
t_H(STA)
START condition hold time after which first clock pulse is generated
t_SU(DAT)
Data setup time
t_H(DAT)
Data hold time
t_SU(STOP)
Setup time for STOP condition
t_(BUF)
Bus free time between START and STOP condition
F_S(CL)
Clock Frequency
ALARM LOGIC TIMING CHARACTERISTICS
t_ALM
Time delay from status register bit toggling to ALERT: LO → HI transition
HOST COMMUNICATION FAILURE
t_timeout
SMBus bus release timeout
t_BOOT
Deglitch for watchdog reset signal
t_WDI
Watchdog timeout period
OUTPUT BUFFER CHARACTERISTICS
V_(SDAL)
Output LO voltage at SDA, I_(SDA) = 3 mA
Tw(H)
Tsu(STA)
SCL
SDA
START
Th(STA)
Th(DAT)
Tf
Tw(L)
Tr
Tf
Th(DAT)
Tsu(DAT)
www.ti.com
MIN TYP MAX UNIT
1
µs
300
ns
4
50
µs
4.7
µs
4.7
µs
4
µs
250
ns
300
ns
4
µs
4.7
µs
10
100 kHz
6
10 ms
25
35 ms
10
msec
140
170
200
s
0.4
V
Tr
STOP
SCL
1
2
3
7
8
9
SDA
ACK
START
SCL
1
2
3
Tsu(STOP)
7
8
9
SDA
ACK
Figure 60.
STOP
T(BUF)
40