XRP7725 Datasheet, PDF (20/34 Pages) Exar Corporation – Power Management System

XRP7725
Intel Node Manager Compatible Programmable
Power Management System
SUPERVISORY AND CONTROL
Power system design with XRP7725 is
accomplished using PA 5.1 design tool. All
figures referenced in the following sections
are taken from PA 5.1. Furthermore, the
following sections reference I²C commands.
For more information on these commands,
refer to ANP-38.
DIGITAL I/O
XRP7725 has two General Purpose Input
Output (GPIO) and three Power System Input
Output (PSIO) user configurable pins.
• GPIOs are 3.3V CMOS logic compatible
and 5V tolerant.
• PSIOs which configured as outputs are
open drain and require external pull-up
resistors. These I/Os are 3.3V and 5V
CMOS logic compatible, and up to 15V
capable.
The polarity of the GPIO/PSIO pins is set in
PA 5.1 or with an I²C command.
Configuring GPIO/PSIOs
The following functions can be controlled from
or forwarded to any GPIO/PSIO:
• Power Group Enable – controls
enabling and disabling of Group 1 and
Group 2
• Power Channel Enable – controls
enabling and disabling of a individual
channel including LDO3.3
• I²C Address Bit – controls an I²C
address bit
• Power OK – indicates that selected
channels have reached their target levels
and have not faulted. Multiple channel
selection is available, in which case the
resulting signal is the AND logic function
of all channels selected
• ResetOut – is delayed Power OK. Delay
is programmable in 1msec increments
with the range of 0 to 255 msecs
• Low V_CC – indicates when V_CC has fallen
below the UVLO fault threshold and
when the UVLO condition clears (V_CC
voltage rises above the UVLO warning
level)
• Interrupt – the controller generated
interrupt selection and clearing is done
through I²C commands
Interrupt, Low V_CC, Power OK and ResetOut
signals can only be forwarded to a single
GPIO/PSIO.
In addition, the following are functions that
are unique to GPIO0 and GPIO1.
• General Output – set with an I²C
command
• General Input – triggers an interrupt;
state read with an I²C command
© 2014 Exar Corporation
20/34
• HW Flags – these are hardware
monitoring functions forwarded to
GPIO0 only. The functions include
Under-Voltage Warning, Over-
Temperature Warning, Over-Voltage
Fault, Over-Current Fault and Over -
Current Warning for every channel.
Rev. 1.0.0