BQ20Z655DBTR-R1 Datasheet, PDF (12/25 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE AND PROTECTION

bq20z655-R1
SLUSAN9 – AUGUST 2011
www.ti.com
SMBus TIMING CHARACTERISTICS (continued)
T_A = –40°C to 85°C Typical Values at T_A = 25°C and V_REG25 = 2.5 V (Unless Otherwise Noted)
PARAMETER
TEST CONDITIONS
MIN
TYP MAX
UNIT
f_(MAS)
SMBus master clock frequency
Master mode, No clock low slave
extend
51.2
kHz
t_(BUF)
Bus free time between start and stop
(see Figure 3)
4.7
µs
t_(HD:STA)
t_(SU:STA)
t_(SU:STO)
t_(HD:DAT)
Hold time after (repeated) start (see Figure 3)
Repeated start setup time (see Figure 3)
Stop setup time (see Figure 3)
Data hold time (see Figure 3)
Receive mode
Transmit mode
4
µs
4.7
µs
4
µs
0
ns
300
t_(SU:DAT)
t_(TIMEOUT)
t_(LOW)
t_(HIGH)
t_(LOW:SEXT)
t_(LOW:MEXT)
Data setup time (see Figure 3)
Error signal/detect (see Figure 3)
Clock low period (see Figure 3)
Clock high period (see Figure 3)
Cumulative clock low slave extend time
Cumulative clock low master extend time
(see Figure 3)
t_f
Clock/data fall time
t_r
Clock/data rise time
See ⁽¹⁾
See ⁽²⁾
See ⁽³⁾
See ⁽⁴⁾
See ⁽⁵⁾
See ⁽⁶⁾
250
ns
25
35
µs
4.7
µs
4
50
µs
25
ms
10
ms
300
ns
1000
ns
(1) The bq20z655-R1 times out when any clock low exceeds t_(TIMEOUT).
(2) t_(HIGH), Max, is the minimum bus idle time. SMBC = SMBD = 1 for t > 50 ms causes reset of any transaction involving bq20z655-R1 that
is in progress. This specification is valid when the NC_SMB control bit remains in the default cleared state (CLK[0]=0).
(3) 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.
(4) 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.
(5) Rise time t_r = VILMAX – 0.15) to (VIHMIN + 0.15)
(6) Fall time t_f = 0.9 V_DD to (VILMAX – 0.15)
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