DRV8808 Datasheet, PDF (22/38 Pages) Texas Instruments – COMBINATION MOTOR DRIVER WITH DC-DC CONVERTER

DRV8808
SLVS857A – DECEMBER 2009 – REVISED AUGUST 2011
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VM
VthVM+
(CSELECT = Open)
(VM = 6 V)
VthVM–
(VM = 5 V)
Capture CSELECT
Then Start Charge Pump
VCP
DCDC_A
CP Start to DC-DC Delay
DCDC_B
10 ms
(Note A)
DCDC_C
120 ms
DLY
(10 ms)
nORT
L
Protection Mask
H
(UVP, OVP)
A. Charge-pump wakeup delay, from 10 ms to 20 ms due to asynchronous event capture.
B. When V_M crosses the Vth_VM+ (about 6.0 V), the CSELECT state is captured. In case of the CSELECT being open
(pulled up to internal 3.3 V), dc-dc regulator channels B and C are turned on.
C. LDO OCP is masked during protection M\mask time.
D. In order to avoid false SPI data latching caused by a rising edge on the STB signal, nSLEEP will remain high during
the power up stage (VM rising) and until nORT is released.
E. DC/DC Channel A follows the Regulator A Control table. During power up, DC/DC Channel A starts up disabled
(SETUP BANK 0 [7] = 1).
Figure 10. Power-up Timing (Power up With DC-DC Turn on by CSELECT)
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