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參數(shù)資料
| 型號： | KIT33972AEWEVBE |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 1/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT EVALUATION FOR MC33972 |
| 標準包裝： | 1 |
| 主要目的： | 接口，開關(guān)探測 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MC33972 |
| 主要屬性： | 8 可編程輸入（電池開關(guān)或接地開關(guān)） |
| 次要屬性： | 14 開關(guān)至接地輸入 |
| 已供物品： | 板，CD |
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Freescale Semiconductor, Inc. reserves the right to change the detail specifications,
as may be required, to permit improvements in the design of its products.
Document Number: MC33972
Rev. 19.0, 3/2012
Freescale Semiconductor
Technical Data
Freescale Semiconductor, Inc., 2009-2012. All rights reserved.
Multiple Switch Detection
Interface with Suppressed
Wake-up
The 33972 Multiple Switch Detection Interface with suppressed
wake-up is designed to detect the closing and opening of up to 22
switch contacts. The switch status, either open or closed, is transferred
to the microprocessor unit (MCU) through a serial peripheral interface
(SPI). The device also features a 22-to-1 analog multiplexer for reading
inputs as analog. The analog input signal is buffered and provided on
the AMUX output pin for the MCU to read.
The 33972 device has two modes of operation, Normal and Sleep.
Normal mode allows programming of the device and supplies switch
contacts with pull-up or pull-down current as it monitors switch change
of state. The Sleep mode provides low quiescent current, which makes
the 33972 ideal for automotive and industrial products requiring low
sleep-state currents.
Features
Designed to operate 5.5 V
≤ VPWR ≤ 26 V
Switch input voltage range -14 V to VPWR, 40 V Max
Interfaces directly to MPU using 3.3 V/5.0 V SPI protocol
Selectable wake-up on change of state
Selectable wetting current (16 or 2.0 mA)
8 programmable inputs (switches to battery or ground)
14 switch-to-ground inputs
Typical standby current - VPWR = 100 μA and VDD = 20 μA
Active interrupt (INT) on change-of-switch state
Figure 1. 33972 Simplified Application Diagram
MULTIPLE SWITCH
DETECTION INTERFACE
EW SUFFIX (Pb-FREE)
98ARH99137A
32-PIN SOICW
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC33972TEW/R2
-40 °C to 125 °C
32 SOICW
MC33972ATEW/R2
MC33972ATEK/R2
32 SOICW EP
33972/A/T
EK SUFFIX (Pb-FREE)
98ASA10556D
32-PIN SOICW EP
VBAT
SP0
SP1
SP7
SG0
SG1
SG12
SG13
VPWR
VDD
WAKE
SI
CS
SO
INT
AMUX
GND
MOSI
SCLK
CS
MISO
INT
AN0
33972
MCU
SCLK
POWER SUPPLY
LVI
ENABLE
WATCHDOG
RESET
VDD
VBAT
VDD
VBAT
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