Battery identification BSI

Different battery types are identified by a pull-down resistor inside the battery pack. In the baseband area of the transceiver, the BSI line has a 150k pull-up to VBB. The MCU can identify the battery by reading the BSI line DC-voltage level with a CCONT (N201) A/ D-converter.

Table 10: Battery Identification

Name

Min

Typ

Max

Unit

Notes

BSI

0

2,85 (VBB)

V

Battery Size Indication pull-up to VBB = 150k ±

5% SIM Card removal detection Treshold = [email protected]

RS

-1%

3,3

+ 1%

Kohm

Indication resistor for BMC-2 battery (640mAh, NiMH)

Rs

-1%

5,6

+ 1%

Kohm

Indication resistor for BMC-3 battery (900mAh, NiMH)

Rs

-1%

75

+ 1%

Kohm

Indication resistor for BLC-2 battery (900mAh, 4.2v Lilon)

Rs

-1%

22

+ 1%

Kohm

Indication resistor for service battery

Note: Nosupportoi4.1vlithium

Note: Nosupportoi4.1vlithium

Battery Bsi Resistor

Figure 10: BSI Connections - All Batteries

The battery identification line is used also for battery removal detection. The BSI line is connected to a SIMCardDetX line of MAD2. SIMCardDetX is a threshold detector with a nominal input switching level 0.85xVcc for a rising edge and 0.55xVcc for a falling edge. The battery removal detection is used as a trigger to power down the SIM card before the power is lost. The BSI contact in the battery contact disconnects before the other contacts so that there is a delay between battery removal detection and supply power off.

Figure 11: SIMCardDetX Detection Levels

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  • myrtle took
    How to identify bsi in battery?
    9 months ago

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