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13892 датащи(PDF) 70 Page - Freescale Semiconductor, Inc |
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13892 датащи(HTML) 70 Page - Freescale Semiconductor, Inc |
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70 / 158 page ![]() 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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