13892 datasheet(70/158 Pages) FREESCALE

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FUNCTIONAL DEVICE OPERATION

OPERATING MODES

Analog Integrated Circuit Device Data



Freescale Semiconductor

MC13892

The GPO1 output is intended to be used for battery thermistor biasing. For accurate thermistor reading by the ADC, the output

resistance of the GPO1 driver is of importance; see ADC Subsystem.

Finally, a muxing option is included to allow GPO4 to be configured for a muxed connection into Channel 7 of the GP ADC.

As an application example, for a dual light sensor application, Channel 7 can be toggled between the ADIN7 (ADINSEL7 = 00)

and GPO4 (ADINSEL7 = 11) for convenient connectivity and monitoring of two sensors. The GPO4 pin is configured for ADC

input mode by default (GPO4ADIN = 1) so that the GPO driver stage is high-impedance at power up. The GPO4 pin can be

configured by software for GPO operation with GPO4ADIN = 0. Refer to ADC Subsystem for GP ADC details.

Table 40. GPO Control Bits

SPI Bit

GPO Control

GPOxEN

GPOx enable

GPOxSTBY

GPOx controlled by STANDBY

x = 1, 2, 3, or 4

Table 41. GPO Control Scheme

GPOxEN

GPOxSTBY

STANDBY

Output GPOx

Low

High

Low

Notes

69.

GPO1 is automatically made active high when a charger is

detected, see Battery Interface and Control for more information.

Table 42. GPO1 Driver Output Characteristics

Parameter

Condition

Min

Typ

Max

Units

GPO1 Output Impedance

Output VCORE Impedance to VCORE

200

–

500

Ohm

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