13892 datasheet(70/161 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

13892

FUNCTIONAL DEVICE OPERATION

OPERATING MODES

When SPI controlled (Watchdog, On, and User Off Wait states), the PWGTDRVx power gate drive pin states are determined

by SPI enable bits PWGTxSPIEN, according to Table 39.

GENERAL PURPOSE OUTPUTS

GPO drivers included can provide useful system level signaling with SPI enabling and programmable Standby control. Key

use cases for GPO outputs include battery pack thermistor biasing and enabling of peripheral devices, such as light sensor(s),

camera flash, or even supplemental regulators.

SPI enabling can be used for coordinating GPOs with ADC conversions for consumption efficiency and desired settling

characteristics.

Four general purpose outputs are provided, summarized in Table 40 and Table 41 (active high polarities assumed).

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 39. Power Gating Logic Table

PWGTxSPIEN

PWGTDRVx

Low

High

Notes

56.

Applicable for Watchdog, On and User Off Wait modes

only. If PWGT1SPIEN AND PWGT2SPIEN both = 1 then

the charge pump is disabled.

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

57.

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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