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If EN is pulled low or if the power from the I C bus pullup resistors is removed for more than t TIMEOUT , the AS3665
enters shutdown .
AS3665
Datasheet, Confidential - D e t a i l e d D e s c r i p t i o n D e v i c e O p e r a t i n g M o d e
2 3
4
Table 4. Exec_Enable Register
Addr: 00h
Exec_Enable Register
Bit
Bit Name
Default Access
Description
Enables the active mode (see Figure 16)
Output drivers disabled, I C communication possible
6
chip_en
0h
R/W
0
AS3665 standby mode select.
Set cp_auto_on =0 before setting chip_en =0.
2
1
0
AS3665 active mode select.
Set cp_auto_on =1 after setting chip_en =1
All functions active, internal oscillator running.
Initialization of the internal memory (see Figure 16)
Memory initialization is finished
7
ram_init
0h
R/W
1
Writing: Reset internal program memory and all
register from 60h...FFh to their default state
Reading: memory initialization ongoing; when finished
an interrupt can be triggered
( init_ready_int (see page 37) is set)
The bit auto_shutdown controls the automatic entering of shutdown mode if the I C bus is disabled:
2
Table 5. Supervision Register
Addr: 08h
Supervision Register
Bit
Bit Name
Default Access
Description
Enables the shutdown mode (see Figure 16)
7
auto_shutdown
1h
R/W
0
AS3665 cannot enter shutdown
do not set pin EN=0 if cp_auto_on =1 or cp_on =1
1
A complete reset cycle can be triggered by setting bit force_reset :
Table 6. Reset_Control Register
AS3665 can use shutdown
EN=0 can be used to enter shutdown mode
Addr: 3Ch
Reset_Control Register
Bit
Bit Name
Default Access
Description
Start reset cycle (see Figure 16)
0
force_reset
0
R/W
0
Normal operation
3. Therefore SCL and SDA both are low.
4. Unless auto_shutdown (see page 13) =0
1
Reset all registers from 00h...1Fh and 5Fh to their
default value
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