AW3643CSR datasheet(17/39 Pages) AWINIC

17 / 39 page

AW3643

Jan 2018 V1.4

www.awinic.com.cn

FUNCTIONAL BLOCK DIAGRAM

Control Logic

/Regsiter

UVLO

OSC

2/4Mhz

IVFM

NTC

monitor

Interface

Thermal Shutdown

Protection

Select

OUT

LED1

LED2

GND

Boost Controller

OVP

VOVP

Current

Limit

TORCH/TEMP

SDA

SCL

INTC=50uA

LED & OUT

Short Detect

AW3643

HWEN

STROBE

FEATURE DESCRIPTION

HWEN & I2C INTERFACE

AW3643 has a logic input HWEN pin to enable/disable the device. When HWEN is set low, the device goes

into shutdown mode, the I2C interface is disabled and all I2C registers are reset to default. In shutdown mode

the device does not respond to any I2C command. When HWEN is set high, the device goes into standby

mode, the I2C interface is enabled, and the device can respond to I2C command.

There are two kinds of power-up sequences, shown in Figure 45 and Figure 46.

If HWEN is tied to IN pin in application, once IN goes above around VPOR (2.0V), HWEN should stay high for at

least twait=2ms time before any I2C command can be accepted.

If HWEN is driven by a GPIO, once HWEN goes from low to high, HWEN should stay high for at least

twait=2ms time before any I2C command can be accepted.

HWEN=IN

2C command

twait≥2ms

Fig 45

Power-Up Sequence with HWEN Tied to IN

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