Figure 6: Power-On With Igt Held Low Before Switching On Operating Voltage At Batt - Siemens AC75 Hardware Interface Description

AC75 Hardware Interface Description
Strictly confidential / Preliminary
BATT+
IGT
PWR_IND
EMERG_RST
VEXT
TXD0/TXD1/RTS0/RST1/DTR0 (driven by the application)
CTS0/CTS1/DSR0/DCD0
Interface pins

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.
AC75_HD_V00.202
t = 400ms >
min
120ms
Undefined
ca. 500 ms
Page 28 of 120
s
HiZ
Defined
27.04.2006