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參數(shù)資料
型號： MC33975TEKR2
廠商： Freescale Semiconductor
文件頁數(shù)： 5/32頁
文件大小： 0K
描述： IC SWITCH DETECT MULT 32-SOIC
標(biāo)準(zhǔn)包裝： 1,000
應(yīng)用： 開關(guān)監(jiān)控
接口： SPI 串行
封裝/外殼： 32-SSOP（0.295"，7.50mm 寬）裸露焊盤
供應(yīng)商設(shè)備封裝： 32-SOICW 裸露焊盤
包裝： 帶卷 (TR)
安裝類型： 表面貼裝
Analog Integrated Circuit Device Data
Freescale Semiconductor
13
33975
FUNCTIONAL DESCRIPTIONS
FUNCTIONAL PIN DESCRIPTION
In Sleep mode with the WAKE pin high, the falling edge of
WAKE
will place the 33975 in Normal mode. In Sleep mode
with VDD applied, the INT pin must be high for a negative
edge of WAKE to wake up the device. If VDD is not applied to
the device in Sleep mode, INT does not affect the WAKE
operation.
LOAD SUPPLY VOLTAGE (VPWR)
The VPWR pin is battery input and Power-ON Reset to the
33975 IC. The VPWR pin requires external reverse battery
and transient protection. The maximum input voltage on
VPWR is 50 V. All wetting, sustain, and internal logic current is
provided from the VPWR pin.
LOGIC VOLTAGE (VDD)
The VDD input pin is used to determine logic levels on the
microprocessor interface (SPI) pins. Current from VDD is
used to drive the SO output, and the pull-up current for CS
and INT pins. VDD must be applied for a wake-up from the
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 33975 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 6 through Table 11 in the Functional
Device Operation section of this datasheet beginning on
page 16. Voltages greater than the VPWR supply voltage will
source current through the SP inputs to the VPWR pin.
Transient battery voltages greater than 38/40 V must be
clamped by an external device.
SWITCH-TO-GROUND (SG0–SG13)
The SGn pins 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
section of this datasheet beginning on page 16. Voltages
greater than the VPWR supply voltage will source current
through the SG inputs to the VPWR pin. Transient battery
voltages greater than 38/40 V must be clamped by an
external device.
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