73S8009C Maxim, 73S8009C Datasheet - Page 9

• Manufacturer Part Number: 73S8009C
• Description: The 73S8009C is a versatile power management and single smart card interface circuit that is ideally suited for smart card reader products that are battery- and/or USB bus-powered
• Manufacturer: Maxim

DS_8009C_025
Rev. 1.5
Pin
Name
ON_OFF
OFF_REQ
OFF_ACK
Pin
(QFN32)
24
11
9
Type
O
I
I
Equivalent
Figure 11
Figure 19
Figure 18
Circuit
Power control pin. Connected to normally open SPST
switch to ground. Closing switch for duration greater
than de-bounce period will turn 73S8009C circuit “on.”
If 73S8009C is “on,” closing switch will turn 73S8009C
to “off” state after the de-bounce period and
OFF_REQ/OFF_ACK handshake.
Digital output. Request to the host system controller to
turn the 73S8009C off. If ON_OFF switch is closed (to
ground) for de-bounce duration and circuit is “on,”
OFF_REQ will go high (Request to turn OFF).
Connected to OFF_ACK via 100 kΩ internal resistor.
Setting OFF_ACK high will power “off” all analog
functions and disconnect the 73S8009C from V
V
connection to OFF_REQ so that when not connected or
no host interaction is required, the Acknowledge will be
true and the circuit will turn “off” immediately with
OFF_REQ.
PC
. The pin has an internal 100 kΩ resistor
Description
73S8009C Data Sheet
BAT
or
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