User's Manual Part 1

MC75 Hardware Interface Description
Strictly confidential / Draft
s
MC75_V00.190a Page 25 of 91 15.02.2005
If configured to a fix baud rate (AT+IPR0), the module will send the URC “^SYSSTART” to
notify that it is ready to operate. If autobauding is enabled (AT+IPR=0) there will be no
notification.
EMERG_RST
VEXT
TXD0/TXD1/RTS0/RST1/DTR0 (driven by the application)
CTS0/CTS1/DSR0/DCD0
ca. 500 ms
Serial interfaces
ASC0 and ASC1
Undefined
Active
PWR_IND
t = 300ms
min
120ms
BATT+
IGT
HiZ
Figure 5: Power-on with operating voltage at BATT+ applied before activating IGT