Nokia 6680 RM-36 Service Manual page 424

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operational modes open-drain and push-pull mode. Open-drain mode is used for card initialization and push-
pull mode for fast command transfer. CMD commands are sent by the host and CMD responses are sent by the
card. DAT is a bi-directional data channel, which operates at push-pull mode.
The detection of RS MMC card removal/insertion is done via RS MMC cover switch. Removing RS MMC while writing
to RS MMC may corrupt data in RS MMC. RS MMC cover switch gives an interrupt to the SW while the cover is
opened or closed. After RS MMC cover lid opening (RS MMC SW signal is connected to GND via cover switch) the
SW power down the RS MMC card and switches off the RS MMC power supply (VSIM2). When the RS MMC cover
lid is closed (RS MMC SW signal is internally connected in Helen3 to 1.8V) the card should be identified if card
exists.
See Also
• RS MMC interface connections (Page 9–35)
Battery interface
The battery interface supports NMP Lynx battery interface for the BL-5C battery. This interface consists of three
connectors: VBAT, BSI and GND. BSI line is used to recognize battery capacity by a battery internal pull down
resistor.
Battery temperature is estimated by measuring separate battery temperature NTC via BTEMP line, which is
located on the transceiver PWB, in a place where phone temperature is most stabile.
For service purposes the device SW can be forced into local mode by using pull down resistors connected to the
BSI line.
See Also
• Battery connector and interface connections & electrical characteristics (Page 9–37)
Battery interface
The battery interface supports NMP Lynx battery interface for the BL-5C battery. This interface consists of three
connectors: VBAT, BSI and GND. BSI line is used to recognize battery capacity by a battery internal pull down
resistor.
Battery temperature is estimated by measuring separate battery temperature NTC via BTEMP line, which is
located on the transceiver PWB, in a place where phone temperature is most stabile.
For service purposes the device SW can be forced into local mode by using pull down resistors connected to the
BSI line.
Page 9–18
Figure 107 Battery pin order
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RM-36
System Module
Issue 1