Turn On Tc65 Using The Vcharge Signal; Figure 6: Power-On With Igt Held Low Before Switching On Operating Voltage At Batt - Siemens TC65 Hardware Interface Description

TC65 Hardware Interface Description
Strictly confidential / Draft
BATT+
IGT
PWR_IND
EMERG_RST
VEXT
TXD0/TXD1/RTS0/RST1/DTR0 (driven by the application)
CTS0/CTS1/DSR0/DCD0
Serial interfaces
ASC0 and ASC1

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

3.3.1.2

Turn on TC65 Using the VCHARGE Signal

As detailed in Section 3.5.7, the charging adapter can be connected regardless of the
module's operating mode.
If the charger is connected to the charger input of the external charging circuit and the
module's VCHARGE pin while TC65 is off, and the battery voltage is above the undervoltage
lockout threshold, processor controlled fast charging starts (see Section 3.5.6). TC65 enters
a restricted mode, referred to as Charge-only mode where only the charging algorithm will be
launched.
During the Charge-only mode TC65 is neither logged on to the GSM network nor are the
serial interfaces fully accessible. To switch to normal operation and log on to the GSM
network, the IGT line needs to be activated as described in Section 3.3.1.
TC65_HD_V00.521
t = 400ms
min
120ms
Undefined
ca. 500 ms
Page 28 of 99
s
HiZ
Active
24.05.2005