HUSB251

Data Sheet

©2023 Hynetek Semiconductor Co., Ltd. All rights reserved.

Page 4 of 21

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

VDD

IFB

VFB

1

2

HUSB251

-ACXXX

-QN24R

3

GPIO5/SDA

4

GPIO1

D+

CS-

GPIO0

5

6

18

17

16

15

14

13

GATE

ADN

GPIO4/SCL

OTP

Figure 2. HUSB251 Pin Assignment

Table 1. HUSB251-ACXXX-QN24R Pin Function Descriptions

Pin No. Pin Name

Type

Description

1

GPIO0

AO

General purpose pin 0.

2

GATE

AO

N-MOSFET Gate driver output for VBUS load switch.

3

VDD

P

Internal 1.5 V regulator output for system power. Connect a 1 μF ceramic capacitor at this

pin.

4

GPIO1

AO

General purpose pin 1. This pin is only open drain output.

5

ADN

AI

ADC input pin for voltage detection.

6

D+

DIO

USB D+ line.

7

D-

DIO

USB D- line.

8

GPIO2

DIO

General purpose pin 2. This pin can be configured as ADC input, digital input, digital output,

pull up or pull down function by firmware.

9

GPIO3

DIO

General purpose pin 3. This pin can be configured as ADC input, digital input, digital output,

pull up or pull down function by firmware.

10

CC1

AIO

USB Type-C CC1 line.

11

CC2

AIO

USB Type-C CC2 line.

12

CS+

AI

Positive input of the current sense amplifier.

13

CS−

AI

Negative input of the current sense amplifier.

14

GPIO4

AO

Multiplex PIN. One is general purpose pin 4. Other is SCL of I2C.

15

GPIO5

AO

Multiplex PIN. One is general purpose pin 5. Other is SDA of I2C.

16

VFB

AI

Feedback point of Constant Voltage (CV) loop, connect CV compensation network to this

pin.

17

IFB

AI

Feedback point of Constant Current (CC) loop, connect CC compensation network to this

pin.

18

OTP

AI

External temperature sensing pin. An internal pull up current source is connected at this

pin. A NTC thermistor is recommended to be place at this pin.

19

GPIO6

DIO

General purpose pin 6. This pin can be configured as ADC input, digital input, digital output,

pull up or pull down function by firmware.

20

GPIO7

DIO

General purpose pin 7. This pin can be configured as ADC input, digital input, digital output,

pull up or pull down function by firmware.

21

VBUS

AI

VBUS sense and discharge pin.