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參數(shù)資料
| 型號： | MCZ33993EWR2 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Multiple Switch Detection Interface |
| 中文描述： | 多交換檢測接口 |
| 文件頁數(shù)： | 12/28頁 |
| 文件大?。?/td> | 504K |
| 代理商： | MCZ33993EWR2 |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
12
33993
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
OPERATIONAL MODES
POWER SUPPLY
The 33993 is designed to operate from 5.5 V to 40 V on
the V
PWR
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 V
PWR
pin. The V
DD
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 V
DD
supply may be removed from the device to
reduce quiescent current. If V
DD
is removed while the device
is in Normal mode, the device will remain in Normal mode. If
V
DD
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 V
DD
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 V
PWR
to the device will cause a Power-ON Reset
and place the device in Normal mode.
Default settings from Power-ON Reset via V
PWR
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 V
PWR
to the IC
Change-of-Switch State (when enabled)
Falling Edge of
WAKE
Falling Edge of
INT
(with V
DD
= 5.0 V and
WAKE
at
Logic [1])
Falling Edge of
CS
(with V
DD
= 5.0 V)
Interrupt Timer Expires
Only in Normal mode with V
DD
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 nterrupt
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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