DRV201_15 Datasheet, PDF (11/29 Pages) Texas Instruments – DRV201 Voice Coil Motor Driver for Camera Auto Focus

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DRV201
SLVSB25C – AUGUST 2011 – REVISED JUNE 2015
7.4 Device Functional Modes
7.4.1 Modes of Operation
SHUTDOWN If the driver detects SCL has a DC level below 0.63 V for duration of at least 0.5 ms, the driver will
enter SHUTDOWN mode. This is the lowest power mode of operation. The driver will remain in
SHUTDOWN for as long as SCL pin remain low.
STANDBY
If SCL goes from low to high the driver enters STANDBY mode and sets the default register values.
In this mode registers can be written to through the I²C interface. Device will be in STANDBY mode
when VCM_CURRENT register is set to zero. From ACTIVE mode the device will enter STANDBY
if the SW_RST bit of the CONTROL register is set. In this case all registers will be reset to default
values.
STANDBY mode is entered from ACTIVE mode if any of the following faults occur: Over
temperature protection fault (OTPF), VCM short (VCMS), or VCM open (VCMO). When
STANDBY mode is entered due to a fault condition current register is cleared.
ACTIVE
The device is in ACTIVE mode whenever the VCM_CURRENT control is set to something else
than zero through the I²C interface. In ACTIVE mode VCM driver output stage is enabled all the
time resulting in higher power consumption. The device remains in ACTIVE mode until the
SW_RST bit in the CONTROL register is set, SCL is pulled low for duration of 0.5 ms,
VCM_CURRENT control is set to zero, or any of the following faults occur: Over temperature
protection fault (OTPF), VCM short (VCMS), or VCM open (VCMO). If ACTIVE mode is entered
after fault the status register is automatically cleared.
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