Sony Ericsson GM48, GM47 manual SIM Detection Simpresence

GM47/GM48 INTEGRATOR’S MANUAL

SIM voltage levels, as shown in the following table, are dependent on the type of SIM card detected by the module.

Signal	Parameter	Mode	Min.	Typ.	Max.	Unit
SIMVCC	SIM supply voltage	3V	2.7	3.0	3.3	V
		5V	4.5	5.0	5.5	V
SIMDAT	High Level Input	3V	2.1		3.0	V
	voltage (VIH)	5V	3.5		5.0	V
SIMDAT	Low Level Input	3V	0		0.9	V
	voltage (VIL)	5V	0		1.5	V
SIMDAT	High Level Output	3V	2.7		3.0	V
	voltage (VOH)	5V	4.7		5.0	V
SIMDAT	Low Level Output	3V	0		0.2	V
	voltage (VOL)	5V	0		0.2	V
SIMCLK	High Level Output	3V	2.4		3.0	V
SIMRST	voltage (VOH)	5V	4.4		5.0	V
SIMCLK	Low Level Output	3V	0		0.35	V
SIMRST	voltage (VOL)	5V	0		0.3	V

2.9.1 SIM Detection - SIMPRESENCE

SIMPRESENCE is used to determine whether a SIM card has been inserted into or removed from the SIM card holder. You should normally wire it to the “card inserted switch” of the SIM card holder, but different implementations are possible.

When left open, an internal pull-up resistor maintains the signal high and means “SIM card missing” to the module. When pulled low the module assumes a SIM card is inserted.

SIMPRESENCE is a Digital 2.75 CMOS input with the following electrical characteristics.

Parameter	Min.	Typ.	Max.	Units
Pull-up resistance (at 2.75 V)	100			kΩ
Low Level Input voltage (SIM inserted)			0.80	V
High Level Input voltage (SIM missing)	>1.93		2.75	V

Note! To meet regulatory approvals SIMPRESENCE must be implemented.

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LZT 123 7263 R1C