Specifications

AC65/AC75 Hardware Interface Description

3.3 Power-Up / Power-Down Scenarios

AC65_AC75_HD_v01.002 Page 31 of 117 2006-10-30

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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 mes-

sage "SHUTDOWN after Illegal PowerUp" to the host application. The alert message appears on the serial inter-

faces 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.

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

ca. 500 ms

Interface pins

Undefined

Defined

For details on how to use EMERG_RST to reset applications

or external devices see Section 3.3.1.6.