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AS3418

Functional Description

Datasheet

• PUBLIC

DS000507

• v4-00 • 2020-Jan-23

│ 31

Figure 37:

Power Up Conditions

Source

Description

MODE/CSCL pin

Depending on the operation mode the power up/down pin

MODE/CSCL pin behaves differently:

Slider Mode: Mode pin has to be driven high turn on the device. Since

the timing can be programmed the value depends also on

POWER_UP_BUT_TIME register setting. With default configuration of

POWER_UP_BUT_TIME register typ. button press time is ~16ms.

Full Slider Mode: Mode pin has to be driven high turn on the device.

Since the timing can be programmed the value depends also on

POWER_UP_BUT_TIME register setting. With default configuration of

POWER_UP_BUT_TIME register typ. button press time is ~16ms.

Push Button Mode: Mode pin has to be driven high turn on the device.

Since the timing can be programmed the value depends also on

POWER_UP_BUT_TIME register setting. With default configuration of

POWER_UP_BUT_TIME register typ. button press time is ~16ms.

I2C start condition

In I2C mode, an I2C start condition turns on the device. For this startup

function I2C_MODE bit must be set in the EEPROM register.

The chip automatically powers down if one of the following conditions arises:

Figure 38:

Power Down Conditions

Source

Description

MODE/CSCL pin

Depending on the operation mode the power MODE/CSCL pin

behaves differently:

Slider Mode: Mode pin has to be driven low for min. 10ms to turn off

the device

Full Slider Mode: Mode pin has to be driven low for min. 10ms to turn

off the device

Push Button Mode: Mode pin has to be high for the time defined in

PWR_DOWN_BUT_TIME register to turn off the device.

I2C power down

command

Power down by serial interface is initiated by clearing the PWR_HOLD

bit. (Please mind that the I2C_MODE bit has to be set before clearing

the PWR_HOLD bit to enable the I2C power down mode)

VNEG over current

Power down if VNEG is higher than the VNEG off-threshold.

6.7.1

Start-Up Sequence

The AS3418 has a defined startup sequence. Once the AS3418 MODE pin is pulled high, the device

initiates the automatic startup sequence shown in Figure 39 or Figure 40 depending on the operation

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