RT9716A Datasheet, PDF (4/17 Pages) Richtek Technology Corporation – Express Card Power Interface Switch

RT9716A/B
Operation
Input Power (1)
AUXIN 3.3VIN 1.5VIN
Off
X
X
On
X
X
On
X
X
On
Off
On
ON >> Off
On
On
On
On
On
On
Table 1. Truth Table for Voltage Outputs
Logic Input
Output (2)
SHDN STBY CPXX (4) ^{AUXOUT 3.3VOUT 1.5VOUT}
Mode (3)
X
X
X
Off
Off
Off
Off
0
X
X
GND
GND
GND Shutdown
1
X
1
GND
GND
GND
No Card
1
1
1 >> 0
Off
Off
Off
Off
1
1
0
On
Off
Off
Standby (5)
1
0
0
On
Off
Off
Standby
1
1
0
On
On
On Card Inserted
(1) For Power Input : “On” means the respective input voltage is higher than its turn on threshold voltage; “Off” means
the input voltage is lower than its UVLO falling threshold voltage. (for AUX input, “Off ” means the voltage is close to
0V).
(2) For Output : “On” means the respective power switch is turned on, so that the input is connected to the output; “Off”
means the power switch and its output discharge FET are both off; “GND ” means the powers switch is off but the
output discharge FET is on, so that the voltage on the output is pulled down to 0V.
(3) Mode assigns each set of input conditions and respective output voltage results to a different name. These modes are
referred to as input conditions in the following “Truth Table” for Logic Outputs.
(4) CPXX = 1 when both CPUSB and CPPE signals are logic high, or CPXX = 0 when either CPUSB or CPPE is low.
(5) The card is inserted prior to the removal of the Primary or Secondary power (either 3.3VIN or 1.5VIN or both) at the
input of the ExpressCard power switch, then only the Primary and Secondary power (both 3.3VOUT and 1.5VOUT)
are removed and the auxiliary power is sent to the ExpressCard slot.
(6) “X” means “Don'st Care”.
Table 2. Truth Table for Logic Output
Input Conditions
Logic Outputs
Mode
SYSRST
RCLKEN (1)
PERST
RCLKEN (2)
OFF
Sh utdo wn
X
X
0
0
No Card
Sta ndb y
0
H i-Z
0
1
0
0
0
0
Card Inserted
1
H i-Z
1
1
1
0
0
0
(1) RCLKEN acts as a logic input in this column. RCLKEN is an I/O pin and it can be driven low externally, left open, or
connected to high-impedance terminals, such as the gate of a MOSFET. It must not be driven high externally.
(2) RCLKEN acts as a logic output in this column.
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DS9716A/B-01 April 2011