Gemalto M2M GmbH AC75 Benutzerhandbuch

AC65/AC75 Hardware Interface Description 
Confidential / Preliminary 

s

 

AC65/AC75_hd_v00.372 

Page 30 of 118 

2006-08-03 

EMERG_RST

PWR_IND

t  =  400ms

min

>

120ms

BATT+

IGT

HiZ

VEXT

TXD0/TXD1/RTS0/RST1/DTR0 (driven by the application)

CTS0/CTS1/DSR0/DCD0

Interface pins

Undefined

Defined

ca. 500 ms

 

Figure 6: Power-on with IGT held low before switching on operating voltage at BATT+ 

 
If the IGT line is driven low for less than 400ms the module will, instead of starting up, send 
only the alert message “SHUTDOWN after Illegal PowerUp” to the host application. The alert 
message appears on the serial interfaces ASC0 and ASC1 at a fixed bit rate of 115200bps. If 
other fixed bit rates or autobauding are set, the URC delivers only undefined characters. The 
message will not be indicated on the USB interface.