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MC33972DWB Scheda tecnica(PDF) 10 Page - Motorola, Inc |
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MC33972DWB Scheda tecnica(HTML) 10 Page - Motorola, Inc |
10 / 28 page 33972 MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA 10 WAKE The WAKE terminal is an open-drain output and a wake-up input. The terminal is designed to control a power supply Enable terminal. In the Normal mode, the WAKE terminal is LOW. In the Sleep mode, the WAKE terminal is HIGH. The WAKE terminal has a pullup to the internal +5.0 V supply. In Sleep mode with the WAKE terminal HIGH, falling edge of WAKE will place the 33972 in Normal mode. In Sleep mode with VDD applied, the INT terminal 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. VPWR The VPWR terminal is battery input and Power-ON Reset to the 33972 IC. The VPWR terminal requires external reverse battery and transient protection. Maximum input voltage on VPWR is 50 V. All wetting, sustain, and internal logic current is provided from the VPWR terminal. VDD The VDD input terminal is used to determine logic levels on the microprocessor interface (SPI) terminals. Current from VDD is used to drive SO output and the pullup current for CS and INT terminals. VDD must be applied for wake-up from negative edge of CS or INT. GND The GND terminal provides ground for the IC as well as ground for inputs programmed as switch-to-battery inputs. 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 4.0 V reference. When programmed to be switch-to-battery, voltages greater than 4.0 V are considered closed. Voltages less than 4.0 V are considered open. The opposite holds true when inputs are programmed as switch-to-ground. Programming features are defined in Table 1 through Table 6 in the Device Operation section of this datasheet beginning on page 12. Voltages greater than the VPWR supply voltage will source current through the SP inputs to the VPWR terminal. Transient battery voltages greater than 40 V must be clamped by an external device. SG0:SG13 The SGn terminals are switch-to-ground inputs only. The input is compared with a 4.0 V reference. Voltages greater than 4.0 V are considered open. Voltages less than 4.0 V are considered closed. Programming features are defined in Table 1 through Table 6 in the Device Operation section of this datasheet beginning on page 12. Voltages greater than the VPWR supply voltage will source current through the SG inputs to the VPWR terminal. Transient battery voltages greater than 40 V must be clamped by an external device. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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