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13892 Datasheet(PDF) 70 Page - Freescale Semiconductor, Inc

Part # 13892
Description  Power Management Integrated Circuit (PMIC) for i.MX35/51
PDF  158 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

13892 Datasheet(HTML) 70 Page - Freescale Semiconductor, Inc

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FUNCTIONAL DEVICE OPERATION
OPERATING MODES
Analog Integrated Circuit Device Data
70
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
0
X
X
Low
1
0
X
High
1
1
0
High
1
1
1
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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