5L35021 datasheet(2/40 Pages) RENESAS

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5L35021 Datasheet

December 15, 2025

Pin Assignments

Figure 1. Pin Assignments for 3 x 3 mm 20-VFQFPN Package – Top View

Pin Descriptions

Table 1. Pin Descriptions

Number

Name

Type

Description

VDDA

Power

VDD 1.8V

SDA_DFC0

I/O

I2C data pin. The pin can be DFC0 function by pin 3 SEL_DFC power-on latch status.

SEL_DFC/

SCL_DFC1

Input

I2C CLK pin.

SEL_DFC is a latch input pin during the power-up.

High on power-on: I2C mode as SCLK function.

Low on power-on: pin 3 SCL and pin 2 SDA as DFC function control pins.

CLKIN/X2

I/O

Crystal oscillator interface output or differential clock input pin (CLKIN).

CLKINB/X1

Input

Crystal oscillator interface input or differential clock input pin (CLKINB).

VBAT

Power

Power supply pin for 32.768kHz DCO; usually connect to coin cell battery, 1.8V.

Unused VBAT can be connected to VDD18.

VSS

Power

Connect to ground.

VDD18

Power

VDD 1.8V.

VSSSE1

Power

Connect to ground.

VDDSE1

Power

Output power supply. Connect to 1.8V. Sets output voltage levels for SE1.

SE1

Output

Output clock SE1.

OE1

Input

OE1’s function selected from OTP pre-programmed register bits.

OE1 pull to 6.5V when burn OTP registers.

Refer to OE Pin Functions table for details.

3 x 3 mm 20-QFN

5L35021

CLKINB/X1

CLKIN/X2

SEL_DFC/SCL_DFC1

SDA_DFCO

VDDA

SE1

OE1

VDDDIFF1

DIFF1B

DIFF1

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