AS3665 datasheet(14/78 Pages) AMSCO

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AS3665

Datasheet, Confidential - D e taile d D e scri pti on Device O pera t in g Mo de

If EN is pulled low or if the power from the I

2C bus pullup resistors is removed3 for more than tTIMEOUT, the AS3665

enters shutdown

The bit auto_shutdown controls the automatic entering of shutdown mode if the I

2C bus is disabled:

A complete reset cycle can be triggered by setting bit force_reset:

3. Therefore SCL and SDA both are low.

Table 4. Exec_Enable Register

Addr: 00h

Exec_Enable Register

Bit

Bit Name

Default Access

Description

chip_en

R/W

Enables the active mode (see Figure 16)

AS3665 standby mode select.

Set cp_auto_on=0 before setting chip_en=0.

Output drivers disabled, I

2C communication possible

AS3665 active mode select.

Set cp_auto_on=1 after setting chip_en=1

All functions active, internal oscillator running.

ram_init

R/W

Initialization of the internal memory (see Figure 16)

Memory initialization is finished

Writing: Reset internal program memory and all

Reading: memory initialization ongoing; when finished

an interrupt can be triggered

(init_ready_int (see page 37) is set)

4. Unless auto_shutdown (see page 13)=0

Table 5. Supervision Register

Addr: 08h

Supervision Register

Bit

Bit Name

Default Access

Description

auto_shutdown

R/W

Enables the shutdown mode (see Figure 16)

AS3665 cannot enter shutdown

do not set pin EN=0 if cp_auto_on=1 or cp_on=1

AS3665 can use shutdown

EN=0 can be used to enter shutdown mode

Table 6. Reset_Control Register

Addr: 3Ch

Reset_Control Register

Bit

Bit Name

Default Access

Description

force_reset

0R/W

Start reset cycle (see Figure 16)

Normal operation

Reset all registers from 00h...1Fh and 5Fh to their

default value

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