GS3470 datasheet(22/169 Pages) SEMTECH

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GS3470

Final Data Sheet

Rev.8

PDS-060500

September 2017

22 of 169

Semtech

www.semtech.com

4.2 Device Power-Up

The GS3470 is designed to operate in a multi-voltage environment which allows any

power-up sequence to be used. Supply pins can all be powered up in any order.

4.2.1 Power-Down Mode

The PWR_DWN pin reduces power to a minimum by disabling various device features.

When the PWR_DWN pin is de-asserted, the device returns to its previous operating

condition within 1 second, without requiring input from the host interface. There are

several power-down options which can be configured through GSPI prior to the device

going into power-down. Table 4-1 provides a summary of the supported power-down

options by accessing the POWER_DOWN register.

Table 4-1: Power-down Mode

Power-down Mode

CSR

Access

DDO

Loop-through

Mode

PCLK Mode

Power-down

PD_PCLK_ENABLE = 0

SERIAL_LOOPBACK_EN = 0

PD_CSR_ACCESS = 0

RC_BYP = X

DDO Disabled

PCLK

Disabled

Power-down with CSR Access

PD_PCLK_ENABLE = 0

SERIAL_LOOPBACK_EN = 0

PD_CSR_ACCESS = 1

RC_BYP = X

Yes

DDO Disabled

PCLK

Disabled

Power-down with PCLK

PD_PCLK_ENABLE = 1

SERIAL_LOOPBACK_EN = 0

PD_CSR_ACCESS = X

RC_BYP = X

Yes

DDO Disabled

PCLK Enabled

Power-down with DDO

PD_PCLK_ENABLE = 0

SERIAL_LOOPBACK_EN = 1

PD_CSR_ACCESS = X

RC_BYP = 1

DDO Enabled

Non-retimed

PCLK

Disabled

Power-down with DDO retimed

PD_PCLK_ENABLE = 0

SERIAL_LOOPBACK_EN = 1

PD_CSR_ACCESS = X

RC_BYP = 0

Yes

DDO Enabled

Retimed

PCLK

Disabled

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