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| 型号： | MC33993DWB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 4/28页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH I/O INTERFACE 32-SOIC |
| 标准包装： | 42 |
| 系列： | * |
| 应用： | * |
| 接口： | * |
| 电源电压： | * |
| 封装/外壳： | 32-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 32-SOIC |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
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Analog Integrated Circuit Device Data
12
Freescale Semiconductor
33993
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
ARCHIVE
INFORMATION
ARCHIVE
INFORMATION
OPERATIONAL MODES
POWER SUPPLY
The 33993 is designed to operate from 5.5 V to 40 V on
the VPWR pin. Characteristics are provided from 8.0 V to
16 V for the device. Switch contact currents and the internal
logic supply are generated from the VPWR pin. The VDD
supply pin is used to set the SPI communication voltage
levels, current source for the SO driver, and pull-up current
on INT and CS.
The VDD supply may be removed from the device to
reduce quiescent current. If VDD is removed while the device
is in Normal mode, the device will remain in Normal mode. If
VDD is removed in Sleep mode, the device will remain in
Sleep mode until wake-up input is received (WAKE high to
low, switch input or interrupt timer expires).
Removing VDD from the device disables SPI
communication and will not allow the device to wake up from
INT and CS pins.
POWER-ON RESET (POR)
Applying VPWR to the device will cause a Power-ON Reset
and place the device in Normal mode.
Default settings from Power-ON Reset via VPWR or Reset
Command are as follows:
Programmable Switch – Set to Switch to Battery
All Inputs Set as Wake-Up
Wetting Current On (16 mA)
Wetting Current Timer On (20 ms)
All Inputs Tri-State
Analog Select 00000 (No Input Channel Selected)
MODES OF OPERATION
The 33993 has two operating modes, Normal mode and
Sleep mode. A discussion on Normal mode begins below.
A discussion on Sleep mode begins on page 17.
NORMAL MODE
Normal mode may be entered by the following events:
Application of VPWR to the IC
Change-of-Switch State (when enabled)
Falling Edge of WAKE
Falling Edge of INT (with VDD = 5.0 V and WAKE at
Logic [1])
Falling Edge of CS (with VDD = 5.0 V)
Interrupt Timer Expires
Only in Normal mode with VDD applied can the registers of
the 33993 be programmed through the SPI.
The registers that may be programmed in Normal mode
are listed below. Further explanation of each register is
provided in subsequent paragraphs.
Programmable Switch Register (Settings Command)
Wake-Up/Interrupt Register (Wake-Up/Interrupt
Command)
Wetting Current Register (Metallic Command)
Wetting Current Timer Register (Wetting Current Timer
Enable Command)
Tri-State Register (Tri-State Command)
Analog Select Register (Analog Command)
Calibration of Timers (Calibration Command)
Reset (Reset Command)
Figure 6 is a graphical description of the device operation
in Normal mode. Switch states are latched into the input
register on the falling edge of CS. The INT to the MCU is
cleared on the rising edge of CS. However, INT will not clear
on rising edge of CS if a switch has closed during SPI
communication (CS low). This prevents switch states from
being missed by the MCU.
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