stm11 STMicroelectronics, stm11 Datasheet - Page 6

• Manufacturer Part Number: stm11
• Description: Power Control Switch
• Manufacturer: STMicroelectronics

Operation
2
2.1
2.2
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Operation
Power-on sequence
●
●
●
Power-off sequence
●
●
Figure 1.
First the momentary push-button switch 'PB' is pressed (and held), at which point the
battery voltage is detected, and if above the threshold, the MOSFET is turned ON,
providing power supply to the application. If the battery voltage is below the threshold,
the MOSFET will remain OFF.
Assuming the battery voltage is above the threshold, after some delay, the controller
begins to drive 'PS
push-button 'PB' signal is released.
The test jig providing the input 'PB
bypasses the normal power ON sequence.
The 'PB' is again pressed (and held), at which point the controller initiates
a power-off sequence by taking 'PS
At this point, once the push-button 'PB' signal is released, the MOSFET is turned OFF
and the V
PS HOLD
Block diagram
PB BYP
OUT
PB
output goes low.
HOLD
' high and keeps the MOSFET ON even after the momentary
VR1
REFERENCE
VOLTAGE
VR2
BYP
–
+
–
HOLD
+
', is used only during manufacturing and
' low.
CONTROL
LOGIC
SLEW
RATE
AND
GND
V IN
V OUT
AM003538a
STM11