XRP7714ILB-0X14-F【PDF 24/29 页】IC REG 5OUT BCK/LINEAR 40TQFN

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?2011 Exar Corporation

24/29

Rev. 1.1.6

Fault and Warning Indication

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:

" 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 COMMUNICATION

The I

C communication is standard 2-wire communication available between the Host and the IC.

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.

Each XRP7714 in an I

C -bus system is activated by sending a valid address to the device. The

address always has to be sent as the first byte after the start condition in the I

C -bus protocol

MSB

R/W

LSB

Fig. 30: Alignment of I2C address in 8 bit byte

There is one address byte required since 7-bit addresses are used. The last bit of the address byte

is the read/write-bit and should always be set according to the required operation. This 7-bit I

address is stored in the NVM. One can program a blank device with the 7-bit Slave address or

select one of the preprogrammed options. The 7-bit address plus the R/W bit create an 8-bit data

value that is sent on the bus.

The XRP7714ILB-0X10-F has an I

C address of 0x10. The internal registers are written by sending

a data value of 0x20 and read by sending a data value of 0x21. This reflects the address being

shifted one bit to the left and the least significant bit being set to reflect a read or write operation

in order to stuff the byte correctly.

The second byte sent to the XRP7714 is the location of a specific register.

Using GPIO3 to select I

C Address

GPIO3 may be used to change the LSB of the 7-bit address. This option can be enabled within the

PowerArchitect

software by checking the Use GPIO3 to control LSB of I2C address box at the

top right of the Digital Design tab. More about the use of this option and other methods of

changing the default I2C address of the part are available in ANP-31 Power

Configuration and

Programming.

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