XRP7714 Exar, XRP7714 Datasheet - Page 23

• Manufacturer Part Number: XRP7714
• Description: Quad Channel Digital PWM Step Down Controller
• Manufacturer: Exar

Each GPIO can be configured to enable a specific power rail for the system.
register allows a GPIO to enable/disable any of the following rails controlled by the chip:
When the configured GPIO is asserted externally, the corresponding rails will be enabled, and they
will be similarly disabled when the GPIO is de-asserted. This supply enabling/disabling can also be
controlled through the I
The GPIO pins can be configured as Power Good indicators for one or more rails. The GPIO pin is
asserted when all rails configured for this specific IO are within specified limits for regulation. This
information can also be found in the READ_PWRGD_SS_FLAG status register.
The GPIOs can be configured to signal Fault or Warning conditions when they occur in the chip.
Each GPIO can be configured to signal one of the following:
I
The I
The communication has the option of enabling Packet Error Checking in order to deal with noisy
environments where bit-errors could occur in the communication. This packet error checking is a
CRC-8 code appended to all communication between the Host and the IC.
The I
Address which will work best in their design (in relation to any other I
E
Select the Inductor for inductance L and saturation current Isat. Select an inductor with Isat higher
than the programmed over current limit. Calculate inductance from:
Where:
Vin is the converter input voltage
Vout is the converter output voltage
fs is the switching frequency
© 2010 Exar Corporation
2
Supply Rail Enable
Power Good Indicator
Fault and Warning Indication
XTERNAL
Inductor Selection
C C
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2
2
OMMUNICATION
C communication is standard 2-wire communication available between the Host and the IC.
C Slave address is saved in the NVM. Therefore, each customer can choose the 7-bit Slave
A single buck power controller
The Standby LDO
Any mix of the Standby LDO and power controller(s)
OCP Fault on Channel 1 - 4
OCP Warning on Channel 1 - 4
OVP Fault on Channel 1 - 4
UVLO Fault on VIN1 or VIN2
UVLO Warning on VIN1 or VIN2
Over Temperature Fault or Warning
C
OMPONENT
2
C interface.
S
ELECTION
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The GPIOx_CFG
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www.DataSheet4U.com
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