Siemens AC75 Specifikace stáhnout pdf (Strana 35)

AC75 Hardware Interface Description

Strictly confidential / Preliminary

AC75_HD_V00.202 Page 35 of 120 27.04.2006

VEXT

See note 1

TXD0/TXD1/RTS0/RTS1/DTR0 (driven by the application)

Interface pins

Undefined

Defined

PWR_IND

CTS0/CTS1/DSR0/DTR0

Figure 8: Signal states during turn-off procedure

Note 1: Depending on capacitance load from host application

3.3.3.2 Leakage Current in Power-Down Mode

The leakage current in Power-down mode varies depending on the following conditions:

• If the supply voltage at BATT+ was disconnected and then applied again without starting

up the AC75 module, the leakage current ranges between 90µA and 100µA.

• If the AC75 module is started and afterwards powered down with AT^SMSO, then the

leakage current is only 50µA.

Therefore, in order to minimize the leakage current take care to start up the module at least

once before it is powered down.

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Siemens AC75 Specifikace Strana 35