RT9758 datasheet(50/61 Pages) RICHTEK

50 / 61 page

RT9758

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS9758-03

May 2023

LSB

MSB

Assume Address = m

Data for Address = m

Data for Address = m + N - 1

Data for Address = m + 1

Assume Address = m

Data for Address = m

Data for Address = m + N - 1

Data for Address = m + 1

Slave Address

Data 1

R/W

Data N

LSB

MSB

Read N bytes of data from Registers

LSB

MSB

Data 2

Data N

LSB

MSB

LSB

Slave Address

Data 1

Data 2

MSB

LSB

Write N bytes of data to Registers

Driven by Master,

Driven by Slave,

Start,

Repeat Start

Stop,

LSB

MSB

Assume Address = m

Data for Address = m

Slave Address

Data

R/W

Read single byte of data from Register

Assume Address = m

Data for Address = m

R/W

Slave Address

Data

MSB

LSB

Write single byte of data to Register

Figure 12. Read and Write Function

Interrupt (INT), STAT, FLAG AND MASK

The INT pin is an open drain structure; users should connect a supply voltage via a current source or pull-up resistors

on the pin. When the device triggers an event, the INT pin will pull low for tINT_PULL_LOW to notify host. The register

map shows all state, flag and control bit of the device.

When the device triggers the event with FLAG, it will send an INT signal to host and set the FLAG bit to 1. The FLAG

bit can be cleared after read. The device will not send another INT signal until the FLAG is cleared and a new event

occurs again. The MASK bit can disable INT pin to send a signal to host. The STAT and FLAG bit are still updated

even though the MASK bit is set to 1.

The STAT bits show current statue of the device and are updated as the status change. All of STAT bits will not send

INT signal to system when the STAT bit is triggered.

Spread Spectrum

The device integrated spread spectrum function for users to optimize the EMI influence on system design. The device

switching frequency is decided by 0x0F[5:3] bit. The spectral density will concentrate on the switching frequency.

Users can enable the spread spectrum function by set 0x0F[6] bit. After the spread spectrum function is enabled, the

device will modulate the switching frequency for ±6% to reduce the spectral density.

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