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MCZ33972AEKR2 데이터시트(PDF) 11 Page - Freescale Semiconductor, Inc |
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MCZ33972AEKR2 데이터시트(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 32 page Analog Integrated Circuit Device Data Freescale Semiconductor 11 33972 FUNCTIONAL DESCRIPTION FUNCTIONAL PIN DESCRIPTION WAKE-UP (WAKE) The WAKE pin is an open-drain output and a wake-up input. The pin is designed to control a power supply Enable pin. In the Normal Mode, the WAKE pin is LOW. In the Sleep Mode, the WAKE pin is HIGH. The WAKE pin has a pull-up to the internal +5.0V supply. In Sleep Mode with the WAKE pin HIGH, the falling edge of WAKE will place the 33972 in Normal Mode. In Sleep Mode with VDD applied, the INT pin must be HIGH for negative edge of WAKE to wake up the device. If VDD is not applied to the device in Sleep Mode, INT does not affect WAKE operation. BATTERY INPUT (VPWR) The VPWR pin is battery input and Power-ON Reset to the 33972 IC. The VPWR pin requires external reverse battery and transient protection. Maximum input voltage on VPWR is 50V. All wetting, sustain, and internal logic current is provided from the VPWR pin. VOLTAGE DRAIN SUPPLY (VDD) The VDD input pin is used to determine logic levels on the microprocessor interface (SPI) pins. Current from VDD is used to drive SO output and the pull-up current for CS and INT pins. VDD must be applied for wake-up from negative edge of CS or INT. GROUND (GND) The GND pin provides ground for the IC as well as ground for inputs programmed as switch-to-battery inputs. PROGRAMMABLE SWITCHES (SP0:SP7) The 33972 device has 8 switch inputs capable of being programmed to read switch-to-ground or switch-to-battery contacts. The input is compared with a 4.0V reference. When programmed to be switch-to-battery, voltages greater than 4.0V are considered closed. Voltages less than 4.0V are considered open. The opposite holds true when inputs are programmed as switch-to-ground. Programming features are defined in Table 6 through Table 11 in the functional Device Operation section of this datasheet beginning on page 13. Voltages greater than the VPWR supply voltage will source current through the SP inputs to the VPWR pin. Transient battery voltages greater than 38/40V must be clamped by an external device. SWITCH-TO-GROUND INPUTS (SG0:SG13) The SGn pins are switch-to-ground inputs only. The input is compared with a 4.0V reference. Voltages greater than 4.0V are considered open. Voltages less than 4.0V are considered closed. Programming features are defined in Table 6 through Table 11 in the functional Device Operation section of this datasheet beginning on page 13. Voltages greater than the VPWR supply voltage will source current through the SG inputs to the VPWR pin. Transient battery voltages greater than 40V must be clamped by an external device. |
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