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MCZ33884EGR2 Datasheet(PDF) 11 Page - Freescale Semiconductor, Inc |
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MCZ33884EGR2 Datasheet(HTML) 11 Page - Freescale Semiconductor, Inc |
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11 / 21 page  Analog Integrated Circuit Device Data Freescale Semiconductor 11 33884 FUNCTIONAL DESCRIPTION FUNCTIONAL PIN DESCRIPTION SYNCHRONIZATION (SYNC) The Synchronization (SYNC) input is used by the slave IC during the Polling mode. The SYNC allows multiple 33884 ICs to poll the multiple inputs concurrently. The master controls the polling period. The slave is allowed to shut down it’s oscillator, thereby conserving current. When the slave receives the SYNC signal from the master, the slave starts the internal oscillator and reads the switch inputs. INTERRUPT (INT) The Interrupt (INT) pin is an interrupt output from the 33884. The INT pin is an open drain output with an internal pull-up. In the Normal mode, a switch state change triggers the INT pin. The INT pin and INT bit (flag) are latched on the falling edge of CS. This procedure determines the interrupt origin. The flag INT bit in the SPI word is the inverse of the INT pin. The INT pin is cleared on the rising edge of CS. The INT pin is active only during the ON time (when sink and source currents are active) in the Polling mode. RESET (RST) The Reset (RST) pin is active low reset input to the 33884. When asserted, the 33884 will reset all internal registers, timers, and enters a Sleep mode (with all switch inputs in a Tri-State condition). Only an MCU SPI command word will wake the 33884 from a Sleep state. The RST pin may be controlled directly from a general purpose input/output (GPIO) pin or from a system/MCU reset. BANDGAP VOLTAGE (VBG) The Bandgap Voltage (VBG) pin requires a 130 k Ω to ground for standard wetting and sustain currents. The device is tested with a 0.1 percent value, but a standard 1.0 percent could be used to function properly. VOLTAGE POWER (VPWR) The Voltage Power (VPWR) pin is battery/supply source pin for the 33884. The VPWR pin requires external reverse battery/supply and transient protection. Maximum input voltage on VPWR is 40 V. All wetting currents and sustain currents are derived from VPWR. SWITCH PINS (SP1 : SP4) The 33884 has four programmable switch sense inputs (SP1- P4) to read switch-to-ground or switch-to-battery/ supply contacts. Transient battery/supply voltages greater than 40 V must be clamped by an external device. Surface mount 0805 MOVs and transient voltage suppressors (TVS) are available in SOT-23 packages. The sensed input is compared with an internal 4.0 V reference. When programmed to sense switch-to-battery, sensed voltages greater than 4.0 V are interpreted as a CLOSED switch, while sensed voltages less than 4.0 V are interpreted as an OPEN switch. The opposite holds true when inputs are programmed to sense switch-to-ground. Further programming can set the wetting currents or make the inputs Tri-State. Programming methods are provided in the following section. SWITCH-TO-BATTERY (SB1 AND SB2) The two Switch-to-Battery (SB) pins sense inputs only. Transient battery/supply voltages greater than 40 V must be clamped by an external device. Surface mount 0805 MOVs and transient voltage suppressors (TVS) are available in SOT-23 packages. The sensed input is compared with an internal 4.0 V reference. Voltages greater than 4.0 V are interpreted as a CLOSED switch, while sensed voltages less than 4.0 V are interpreted as an OPEN switch. Programming can set wetting currents or Tri-State the input. Programming methods are provided in the following section. SWITCH-TO-GROUND (SG1 : SG6) The six Switch-to-Ground (SG) pins are inputs only. The input is compared with the internal 4.0 V reference. Voltages greater than 4.0 volts are interpreted as an OPEN switch. Voltages less than 4.0 V are interpreted as a CLOSED switch. Programming can set the wetting currents or Tri-State the input. Programming methods are provided in the following section. |
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