Specifications

AC65/AC75 Hardware Interface Description
3.3 Power-Up / Power-Down Scenarios
s
AC65_AC75_HD_v01.002 Page 35 of 117 2006-10-30
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Abbreviations used in the table:
3.3.3 Turn off AC65/AC75
AC65/AC75 can be turned off as follows:
• Normal shutdown: Software controlled by AT^SMSO command
• Automatic shutdown: Takes effect if board or battery temperature is out of range or if undervoltage or over-
voltage conditions occur.
3.3.3.1 Turn off AC65/AC75 Using AT Command
The best and safest approach to powering down AC65/AC75 is to issue the AT^SMSO command. This proce-
dure lets AC65/AC75 log off from the network and allows the software to enter into a secure state and safe data
before disconnecting the power supply. The mode is referred to as Power-down mode. In this mode, only the
RTC stays active.
Before switching off the device sends the following response:
^SMSO: MS OFF
OK
^SHUTDOWN
After sending AT^SMSO do not enter any other AT commands. There are two ways to verify when the module
turns off:
• Wait for the URC “^SHUTDOWN”. It indicates that data have been stored non-volatile and the module turns
off in less than 1 second.
• Also, you can monitor the PWR_IND pin. High state of PWR_IND definitely indicates that the module is
switched off.
GPIO9 I Tristate IO
GPIO10 I Tristate IO
DAC_OUT L O
DAI0 I Tristate O
DAI1 I Tristate I
DAI2 I Tristate O
DAI3 I Tristate O
DAI4 I Tristate I
DAI5 I Tristate I
DAI6 I Tristate I
L = Low output level
H = High output level
I = Input
O = Output
PD = Pull down with min +15µA and max. +100µA
PD(...k) = Fix pull down resistor
PU = Pull up with min -15µA and max. -100µA
PU(...k) = Fix pull up resistor
Table 6: Signal states
Signal name Undefined state
during startup
Defined state after
initialization
Active state after configuration by AT
command
GPIO SPI I
2
C DAI