UCS81003 datasheet(47/108 Pages) MICROCHIP

47 / 108 page

 2014 Microchip Technology Inc.

DS20005334A-page 47

UCS81003

During power-on reset (POR), the default values are

stored in the registers. A POR is initiated when power

is first applied to the part and the voltage on the VDD

supply surpasses the VDD_TH level, as specified in the

electrical characteristics. Any reads to undefined

registers will return 00h. Writes to undefined registers

will not have an effect.

When a bit is “set”, this means that the user writes a

logic ‘1’ to it. When a bit is “cleared”, this means that the

user writes a logic ‘0’ to it.

10.1

Current Measurement Register

(Address 00h)

The

Current

Measurement

stores

the

measured current value delivered to the portable

device (IBUS). This value is updated continuously while

the device is in the Active power state. The bit weights

are in mA and the range is from 0 mA to 2988.6A (the

maximum value corresponds to 255 LSB, where

1LSB =11.72 mA).

This data will be cleared when the device enters the

Sleep or Detect states. This data will also be cleared

whenever the port power switch is turned off (including

during emulation or any time that VBUS is discharged).

10.2

Total Accumulated

Charge Registers

The Total Accumulated Charge registers store the total

accumulated charge delivered from the VS source to a

portable device. The bit weighting of the registers is

given in mAh. The register value is reset to 00_00h only

when the RTN_RST bit is set or if the RTN_EN bit is

cleared. This value will be retained when the device

transitions out of the Active state and resumes

accumulation if the device returns to the Active state

and charge rationing is still enabled.

These registers are updated every one (1) second

while the UCS81003 is in the Active power state. Every

time the value is updated, it is compared against the

target value in the Charge Rationing Threshold

registers

(see

Section 10.6

“Charge

Rationing

Threshold Registers”).

49h

Custom Emulation Stimulus

3 - Config 1

R/W

Sets the stimulus and timing for

Stimulus 3

00h

4Ah

Custom Stimulus/Response

Pair 3 - Config 2

R/W

Sets the response and magnitude for

Stimulus 3

00h

4Bh

Custom Stimulus/Response

Pair 3 - Config 3

R/W

Sets the threshold and pull-up/pull-down

settings for Stimulus 3

00h

4Ch

Custom Stimulus/Response

Pair 3 - Config 4

R/W

Sets the resistor ratio for Stimulus 3

00h

50h

Applied Current Limiting

Behavior

Indicates the applied current limiting

behavior

82h

51h

Custom Current Limiting

Behavior Config

R/W

Controls the custom current limiting

behavior

82h

FDh

Product ID

Stores a fixed value that identifies each

product

4Eh

FEh

Manufacturer ID

Stores a fixed value that identifies

Microchip

5Dh

FFh

Revision

Stores a fixed value that represents the

revision number

82h

TABLE 10-1:

Address

R/W

Function

Default

Value

Page

No.

Name

Bits Address Cof

Default

Current Measurement

00h

Name

Bits Address

Cof

Default

Total Accumulated

Charge High Byte

01h

00h

Total Accumulated

Charge Middle High

02h

00h

Total Accumulated

Charge Middle Low Byte

03h

00h

Total Accumulated

Charge Low Byte

04h

00h

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