P9221-R Datasheet

© 2017 Integrated Device Technology, Inc.

25

October 10, 2017

11. Functional Registers

The following tables provide the address locations, field names, available operations (R or RW), default values, and functional descriptions of

all the internally accessible registers contained within the P9221-R. The default I2 C slave address is 61HEX. The address of each register has a

two-byte structure. For example, the low byte of major firmware revision must be read with two bytes address with 00HEX and 04HEX.

Table 9.

Device Identification Register

Address and Bit

Register or Bit Field Name

R/W

Default

Function and Description

0000HEX [7:0]

Part_number_L

R

20HEX

P9221-R chip identification low byte

0001HEX [7:0]

Part_number_H

R

92HEX

P9221-R chip identification high byte

Table 10. Firmware Major Revision

Address and Bit

Register or Bit Field Name

R/W

Default

Function and Description

0004HEX [7:0]

FW_Major_Rev_L

R

01HEX

Major firmware revision low byte

0005HEX [7:0]

FW_Major_Rev_H

R

00HEX

Major firmware revision high byte

Table 11. Firmware Minor Revision

Address and Bit

Register or Bit Field Name

R/W

Default

Function and Description

0006HEX [7:0]

FW_Minor_Rev_L

R

29HEX

Minor firmware revision low byte

0007HEX [7:0]

FW_Minor_Rev_H

R

04HEX

Minor firmware revision high byte

Table 12. Status Registers

Address and Bit

Register or Bit Field Name

R/W

Default

Function and Description

0034HEX [7]

Vout_Status

R

0BIN

“0” output voltage is off.

“1” output voltage is on.

0034HEX [6]

Reserved

R

0BIN

0034HEX [5]

Reserved

R

0BIN

0034HEX [4]

Reserved

R

0BIN

0034HEX [3]

Reserved

R

0BIN

0034HEX [2]

Thermal_SHTDN_Status

R

0BIN

“0” indicates no over-temperature condition exists.

“1” indicates that the die temperature exceeds 130°C or the

NTC reading is less than 0.6V. The P9221-R sends an End

Power Transfer (EPT) packet to the transmitter.

0034HEX [1]

VRECT_OV_Status

R

0BIN

“1” indicates the rectifier voltage exceeds 20V for VOUT=12V. In

this case, the P9221-R sends an End Power Transfer (EPT)

packet to the transmitter.