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参数资料
| 型号： | KIT33975AEWEVBE |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 19/32页 |
| 文件大小： | 0K |
| 描述： | KIT EVALUATION FOR MC33975 |
| 标准包装： | 1 |
| 主要目的： | 接口，开关探测 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MC33975 |
| 主要属性： | 8 可编程输入（电池开关或接地开关） |
| 次要属性： | 14 开关至接地输入 |
| 已供物品： | 板，CD |
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Analog Integrated Circuit Device Data
26
Freescale Semiconductor
33975
TYPICAL APPLICATIONS
OPERATIONAL MODES
Therefore, when sending the sleep command, one device will
enter sleep before the other. For multiple devices in a system,
it is recommended that the devices are controlled in serial (S0
from first device is connected to SI of second device). With
two devices, 48 clock pulses are required to shift data in.
When the WAKE feature is used to enable the power supply,
both WAKE pins should be connected to the enable pin on the
power supply. The INT pins may be connected to one
interrupt pin on the MCU, or may have their own dedicated
interrupt to the MCU.
The transition from Normal to Sleep mode is done by sending
the sleep command. With the devices connected in serial and
the sleep command sent, both will enter Sleep mode on the
rising edge of CS. When Sleep mode is entered, the WAKE
pin will be logic [1]. If either device wakes up, the WAKE pin
will transition low, waking the other device.
A condition exists where the MCU is sending the sleep
command (CS logic [0]) and a switch input changes state.
With this event, the device that detects this input will not
transition to Sleep mode, while the second device will enter
Sleep mode. In this case, two switch status commands must
be sent to receive accurate switch status data. The first
switch status command will wake the device in Sleep mode.
Switch status data may not be valid from the first switch
status command because of the time required for the input
voltage to rise above the 4.0 V input comparator threshold.
This time is dependant on the impedance of SGn or SPn
node. The second switch status command will provide
accurate switch status information. It is recommended that
the software wait 10 to 20 ms between the two switch status
commands, allowing time for switch input voltages to
stabilize. With all switch states acknowledged by the MCU,
the sleep sequence may be initiated. All parameters for Sleep
mode should be updated prior to sending the sleep
command.
The 33975 IC has an internal 5.0 V supply from the VPWR
pin. A POR circuit monitors the internal 5.0 V supply. In the
event of transients on the VPWR pin, an internal reset may
occur. Upon reset the 33975 will enter Normal mode with the
is recommended that the MCU periodically update all
registers internal to the IC.
USING THE WAKE FEATURE
The 33975 provides a WAKE output and wake-up input
designed to control an enable pin on system power supply.
While in the Normal mode, the WAKE output is low, enabling
the power supply. In the Sleep mode, the WAKE pin is high,
disabling the power supply. The WAKE pin has a passive pull-
up to the internal 5.0 V supply but may be pulled up through
When the WAKE output is not used the pin should be pulled
up to the VDD supply through a resistor, as shown in
During the Sleep mode, a switch closure will set the WAKE
pin low, causing the 33975 to enter the Normal mode. The
power supply will then be activated, supplying power to the
VDD pin and the microprocessor and the 33975. The
microprocessor can determine the source of the wake-up by
reading the interrupt flag.
COST AND FLEXIBILITY
Systems requiring a significant number of switch interfaces
have many discrete components. Discrete components on
standard PWB consume board space and must be checked
for solder joint integrity. An integrated approach reduces
solder joints, consumes less board space, and offers wider
operating voltage, analog interface capability, and greater
interfacing flexibility.
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