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参数资料
| 型号： | MC33972ATEW |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 6/32页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH DETECT SPI 32-SOIC |
| 标准包装： | 42 |
| 应用： | 开关监控 |
| 接口： | SPI 串行 |
| 电源电压： | 3.1 V ~ 5.25 V |
| 封装/外壳： | 32-BSSOP 裸露焊盘 |
| 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
14
Freescale Semiconductor
33972
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
POWER SUPPLY
The 33972 is designed to operate from 5.5 to 40 V on the
VPWR pin. Characteristics are provided from 8.0 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 a 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 the
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)
NORMAL AND SLEEP MODES
The 33972 has two operating modes, Normal mode and
Sleep mode. A discussion on Normal mode begins below.
A discussion on Sleep mode begins on page 19.
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 33972 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, page 9, 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.
PROGRAMMABLE SWITCH REGISTER
Inputs SP0 to SP7 may be programmable for switch-to-
battery or switch-to-ground. These inputs types are defined
using the settings command (Table 6). To set an SPn input
for switch-to-battery, a logic [1] for the appropriate bit must be
set. To set an SPn input for switch-to-ground, a logic [0] for
the appropriate bit must be set. The MCU may change or
update the programmable switch register via software at any
time in Normal mode. Regardless of the setting, when the
SPn input switch is closed a logic [1] will be placed in the
WAKE-UP/INTERRUPT REGISTER
The wake-up/interrupt register defines the inputs that are
allowed to wake the 33972 from Sleep Mode or set the INT
pin LOW in Normal mode. Programming the wake-up/
interrupt bit to logic [0] will disable the specific input from
generating an interrupt and will disable the specific input from
waking the IC in Sleep mode (Table 7). Programming the
wake-up/interrupt bit to logic [1] will enable the specific input
to generate an interrupt with switch change of state and will
enable the specific input as wake-up. The MCU may change
or update the wake-up/interrupt register via software at any
time in Normal mode.
Table 6. Settings Command
Settings Command
Not used
Battery/Ground Select
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
X
sp7 sp6 sp5 sp4 sp3 sp2 sp1 sp0
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