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7.28 Timing Requirements – I
2
C Interface, 400kHz Mode (continued)
Typical values stated where T
A
= 25°C and V
BAT
= 55.0 V, min/max values stated where T
A
= -40°C to 85°C and V
BAT
= 4.7 V
to 55 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
SU:STO
Setup time STOP condition
(1)
0.6 µs
t
BUF
Bus free time STOP to START
(1)
1.3 µs
t
RST
I
2
C bus reset
(1)
Bus interface is reset if SCL is detected
low for this duration
1.9 2.1 s
R
PULLUP
Pullup resistor
(2)
Pullup voltage rail ≤ 5 V 1.5 kΩ
(1) Specified by design
(2) Specified by characterization
7.29 Timing Requirements – HDQ Interface
Typical values stated where T
A
= 25°C and V
BAT
= 55.0 V, min/max values stated where T
A
= -40°C to 85°C and V
BAT
= 4.7 V
to 55 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
B
Break Time
(1)
190 µs
t
BR
Break Recovery Time
(1)
40 µs
t
HW1
Host Write 1 Time
(1)
Host drives HDQ 0.5 50 µs
t
HW0
Host Write 0 Time
(1)
Host drives HDQ 86 145 µs
t
CYCH
Cycle Time, Host to device
(1)
Device drives HDQ 190 µs
t
CYCD
Cycle Time, device to Host
(1)
Device drives HDQ 190 205 250 µs
t
DW1
Device Write 1 Time
(1)
Device drives HDQ 32 50 µs
t
DW0
Device Write 0 Time
(1)
Device drives HDQ 80 145 µs
t
RSPS
Device Response Time
(1) (3)
Device drives HDQ 190 µs
t
TRND
Host Turn Around Time
(1)
Host drives HDQ after device drives HDQ 210 µs
t
RISE
HDQ Line Rising Time to Logic 1
(1)
1.8 µs
t
RST
HDQ Bus Reset
(1)
Host holds bus low to initiate device
interface reset
1.9 2.1 s
R
PULLUP
Pullup Resistor
(2)
Pullup voltage rail ≤ 5 V 1.5 kΩ
(1) Specified by design
(2) Specified by characterization
(3) Response time may vary due to internal device processing
7.30 Timing Requirements – SPI Interface
Typical values stated where T
A
= 25°C and V
BAT
= 55.0 V, min/max values stated where T
A
= -40°C to 85°C and V
BAT
= 4.7 V
to 55 V (unless otherwise noted). All values specified with SPI pin filtering enabled.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
SCK
SPI clock period
(1)
500
(4)
ns
t
LEAD
Enable lead-time
(1)
625 ns
t
LAG
Enable lag time
(1)
50 ns
t
TD
Sequential transfer delay
(2)
50 µs
t
SU
Data setup time
(1) (5)
50 ns
t
HI
Data hold time (inputs)
(1) (5)
50 ns
t
HO
Data hold time (outputs)
(1)
0 ns
t
A
Responder access time
(1)
500 ns
t
DIS
Responder DOUT disable time
(1)
450 ns
t
V
Data valid
(1)
235
(4)
ns
BQ76942
SLUSE14B – DECEMBER 2020 – REVISED DECEMBER 2021
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