Datasheet

15
bq2954
Impedance (T
A
=T
OPR
;V
CC
= 5V
±
10%)
Symbol Parameter Minimum Typical Maximum Unit Notes
R
BATZ
BAT pin input impedance 50 - - M
Ω
R
SNSZ
SNS pin input impedance 50 - - M
Ω
R
TSZ
TS pin input impedance 50 - - M
Ω
R
PROG1
Soft-programmed pull-up or pull-down
resistor value (for programming)
--10
k
Ω
DSEL, CSEL
R
PROG2
Pull-up or pull-down resistor value - - 3 k
Ω
I
TERM
R
MTO
Charge timer resistor 20 - 480 k
Ω
Timing (T
A
=T
OPR
;V
CC
= 5V
±
10%)
Symbol Parameter Minimum Typical Maximum Unit Notes
t
MTO
Charge time-out range 1 - 24 hours See Figure 10
t
QT
Pre-charge qual test time-out period -
0.25 ∗ t
MTO
--
t
HO
Pre-charge qual test hold-off period 300 600 900 ms
f
PWM
PWM regulator frequency range - 100 200 kHz See Equation 7
d
PWM
Duty cycle 0 - 80 %
Capacitance
Symbol Parameter Minimum Typical Maximum Unit
C
MTO
Charge timer capacitor - - 0.1
µ
F
C
PWM
PWM capacitor - 0.001 -
µ
F