Rainbow Electronics ATA6625 - Manual (Page 5)

5
4957E–AUTO–10/07
ATA6623/ATA6625
4. Mode of Operation
Figure 4-1. Mode of Operation
Unpowered Mode
V
Batt
= 0V
a: V
S
> 5V
b: V
S
< 4V
c: Bus wake-up event
d: NRES switches to low
Pre-normal Mode
Normal Mode
VCC: 3.3V/5V/50 mA
with undervoltage
monitoring
Communication: ON
VCC: 3.3V/5V/50 mA
with undervoltage monitoring
Communication: OFF
Silent Mode
VCC: 3.3V/5V/50 mA
with undervoltage monitoring
Communication: OFF
Sleep Mode
VCC: switched off
Communication: OFF
Go to silent command
a
TXD = 0
EN = 0
TXD = 1
EN = 0
EN = 1
EN = 1
EN = 1
b
b
b
c + d
d
c
b
Local wake-up event
Go to sleep command