5 Pin Configuration and Functions

Figure 5-1 RSH Package56-Pin QFNTop View

Table 5-1 Pin Functions

PIN		TYPE⁽²⁾	RESET STATE⁽¹⁾	DESCRIPTION
NAME	NO.	TYPE⁽²⁾	RESET STATE⁽¹⁾	DESCRIPTION
ADCIN1	6	I	Input	Boot configuration Input. Connect to resistor divider between LDO_3V3 and GND.
ADCIN2	10	I	Input	I2C address configuration Input. Connect to resistor divider between LDO_3V3 and GND.
C_CC1	24	I/O	High-Z	Output to Type-C CC or VCONN pin . Filter noise with capacitor to GND
C_CC2	26	I/O	High-Z	Output to Type-C CC or VCONN pin . Filter noise with capacitor to GND
C_USB_N (GPIO19)	53	I/O	Input (High-Z)	USB D– connection for BC1.2 support
C_USB_P (GPIO18)	50	I/O	Input (High-Z)	USB D+ connection for BC1.2 support
DRAIN1	8, 15, 19, 58	—	—	Drain of internal power path 1. Connect thermal pad 58 to as big of pad as possible on PCB for best thermal performance. Short the other pins to this thermal pad
DRAIN2	7, 52, 56, 57	—	—	Drain of internal power path 2. Connect thermal pad 57 to as big of pad as possible on PCB for best thermal performance. Short the other pins to this thermal pad
GND	20, 45 , 46, 47, 51	—	—	Unused pin. Tie to GND.
GPIO0	16	I/O	Input (High-Z)	General Purpose Digital I/O 0. Float pin when unused. GPIO0 is asserted low during the TPS65987D boot process. Once device configuration and patches are loaded GPIO0 is released
GPIO1	17	I/O	Input (High-Z)	General Purpose Digital I/O 1. Ground pin with a 1-MΩ resistor when unused in the application
GPIO2	18	I/O	Input (High-Z)	General Purpose Digital I/O 2. Float pin when unused
GPIO3 (HPD)	30	I/O	Input (High-Z)	General Purpose Digital I/O 3. Configured as Hot Plug Detect (HPD) TX and RX when DisplayPort alternate mode is enabled. Float pin when unused
GPIO4	31	I/O	Input (High-Z)	General Purpose Digital I/O 4. Float pin when unused
I2C3_SCL (GPIO5)	21	I/O	Input (High-Z)	I2C port 3 serial clock. Open-drain output. Tie pin to I/O voltage through a 10-kΩ resistance when used. Float pin when unused
I2C3_SDA (GPIO6)	22	I/O	Input (High-Z)	I2C port 3 serial data. Open-drain output. Tie pin to I/O voltage through a 10-kΩ resistance when used. Float pin when unused
I2C3_IRQ (GPIO7)	23	I/O	Input (High-Z)	I2C port 3 interrupt detection (port 3 operates as an I2C Master Only). Active low detection. Connect to the I2C slave's interrupt line to detect when the slave issues an interrupt. Float pin when unused
GPIO12	40	I/O	Input (High-Z)	General Purpose Digital I/O 12. Float pin when unused
GPIO13	41	I/O	Input (High-Z)	General Purpose Digital I/O 13. Float pin when unused
GPIO14 (PWM)	42	I/O	Input (High-Z)	General Purpose Digital I/O 14. May also function as a PWM output. Float pin when unused
GPIO15 (PWM)	43	I/O	Input (High-Z)	General Purpose Digital I/O 15. May also function as a PWM output. Float pin when unused
GPIO16 (PP_EXT1)	48	I/O	Input (High-Z)	General Purpose Digital I/O 16. May also function as single wire enable signal for external power path 1. Pull-down with external resistor when used for external path control. Float pin when unused
GPIO17 (PP_EXT2)	49	I/O	Input (High-Z)	General Purpose Digital I/O 17. May also function as single wire enable signal for external power path 2. Pull-down with external resistor when used for external path control. Float pin when unused
GPIO20	54	I/O	Input (High-Z)	General Purpose Digital I/O 20. Float pin when unused
GPIO21	55	I/O	Input (High-Z)	General Purpose Digital I/O 21. Float pin when unused
HRESET	44	I/O	Input	Active high hardware reset input. Will reinitialize all device settings. Ground pin when HRESET functionality will not be used
I2C1_IRQ	29	O	High-Z	I2C port 1 interrupt. Active low. Implement externally as an open drain with a pull-up resistance. Float pin when unused
I2C1_SCL	27	I/O	High-Z	I2C port 1 serial clock. Open-drain output. Tie pin to I/O voltage through a 10-kΩ resistance when used or unused
I2C1_SDA	28	I/O	High-Z	I2C port 1 serial data. Open-drain output. Tie pin to I/O voltage through a 10-kΩ resistance when used or unused
I2C2_IRQ	34	O	High-Z	I2C port 2 interrupt. Active low. Implement externally as an open drain with a pull-up resistance. Float pin when unused
I2C2_SCL	32	I/O	High-Z	I2C port 2 serial clock. Open-drain output. Tie pin to I/O voltage through a 10-kΩ resistance when used or unused
I2C2_SDA	33	I/O	High-Z	I2C port 2 serial data. Open-drain output. Tie pin to I/O voltage through a 10-kΩ resistance when used or unused
LDO_1V8	35	PWR	—	Output of the 1.8-V LDO for internal circuitry. Bypass with capacitor to GND
LDO_3V3	9	PWR	—	Output of the VBUS to 3.3-V LDO or connected to VIN_3V3 by a switch. Main internal supply rail. Used to power external flash memory. Bypass with capacitor to GND
PP_CABLE	25	PWR	—	5-V supply input for port 1 C_CC pins. Bypass with capacitor to GND
PP_HV1	11, 12	PWR	—	System side of first VBUS power switch. Bypass with capacitor to ground. Tie to ground when unused
PP_HV2	1, 2	PWR	—	System side of second VBUS power switch. Bypass with capacitor to ground. Tie to ground when unused
SPI_CLK	38	I/O	Input	SPI serial clock. Ground pin when unused
SPI_POCI	36	I/O	Input	SPI serial controller input from peripheral. Ground pin when unused
SPI_PICO	37	I/O	Input	SPI peripheral serial controller output to slave. Ground pin when unused
SPI_CS	39	I/O	Input	SPI chip select. Ground pin when unused
VBUS1	13, 14	PWR	—	Port side of first VBUS power switch. Bypass with capacitor to ground. Tie to VBUS2
VBUS2	3, 4	PWR	—	Port side of second VBUS power switch. Bypass with capacitor to ground. Tie to VBUS1
VIN_3V3	5	PWR	—	Supply for core circuitry and I/O. Bypass with capacitor to GND
Thermal Pad (PPAD)	59	GND	—	Ground reference for the device as well as thermal pad used to conduct heat from the device. This connection serves two purposes. The first purpose is to provide an electrical ground connection for the device. The second purpose is to provide a low thermal-impedance path from the device die to the PCB. This pad must be connected to a ground plane

(1) Reset State indicates the state of a given pin immediately following power application, prior to any configuration from firmware.

(2) I = input, O = output, I/O = bidirectional, GND = ground, PWR = power, NC = no connect