FP6606 datasheet(69/73 Pages) FITIPOWER

69 / 73 page

FP6606

FP6606- Preliminary 0.3-JUN-2018

VBUS Control Register (address = 0xD0) [reset = 0x00]

The FBO pin of FP6606 must be connected to the feedback node of power stage. The upper feedback resistance of power stage needs to

select 100k Ohm and the VBUS of power stage also designs to default 5V. Consequently, the VBUS could be increased or decreased by

sinking or sourcing current from FBO pin of the FP6606.

The scale of FBO pin sink/source current is set by 11-bit MCU IT counter (Reg.0xD2~D1). The VBUS is default 5V when MCU IT counter is

default C8h (200 in decimal) and the FBO pin is no operation. If the value of MCU IT counter is set to lower than C8h, the FBO pin will

source current and the VBUS will be decreased. The lowest VBUS is 3V when MCU IT counter is set to zero. However, in case the value of

MCU IT counter is set to larger than C8h (200 in decimal), the FBO pin will sink current and the VBUS will be increased. The highest VBUS

is 23.47V when MCU IT counter is full (7FFh).

VBUS Control Register

MCU_CTRL_

VOLT_RST

Reserved

MCU_VOLT_

EN_CTRL

LEGEND: R/W = Read/Write; R = Read only

VBUS Control Register Descriptions

Bit

Field

Type

Reset

Description

MCU_CTRL_VOLT_RST

MCU Voltage Control Reset:

TCPM reset MCU IT counter and FP6606 will clear this bit

automatically.

0b: No operation

1b: Reset MCU IT counter. VBUS Target Control Register

(Reg.0xD1~D2) reset to default value. The VBUS will be reset to 5V

when TCPM writes this bit with a 1b

6:1

Reserved

0x00

Reserved

MCU_VOLT _EN_CTRL

MCU Voltage Control Enable:

0b: MCU IT counter is controlled by FP6606

1b: MCU IT counter is controlled by TCPM through setting VBUS

Target Control Register (Reg.0xD1~D2)

VBUS Target Control Byte 0 Register (address = 0xD1) [reset = 0xC8]

VBUS Target Control Byte 0 Register

MCU_IT_CNT_L

LEGEND: R/W = Read/Write; R = Read only

VBUS Target Control Byte 0 Register Descriptions

Bit

Field

Type

Reset

Description

7:0

MCU_IT_CNT_L

0xC8

MCU IT Counter Low:

The MCU IT counter is validly set only by even number. Each bit of

MCU IT counter represents 10mV of VBUS. The resolution of VBUS is

20mV because only even number can be set to MCU IT counter.

The MCU IT counter is 11-bit, which is configured as follow equation:

MCU_IT_CNT [10:0]= MCU_IT_CNT_H [10:8] + MCU_IT_CNT_L [7:0]

FP6606 Datasheet(PDF) 69 Page - Fitipower Integrated Technology Inc.

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