NXP Semiconductors

SC18IS604

6.5.9 Deep Power-down mode

002aab725

0x30

COMMAND

SPI host sends

0x5A

CS

SCLK

MOSI

character 0xA5

character 0x5A

character 0x30

0xA5

Figure 16. Deep Power-down mode

SC18IS604 can be placed in a low-power mode where the internal oscillator is stopped

and it will no longer respond to SPI messages. Enter the Power-down mode by sending

the power-down command (0x30) followed by the two defined bytes, which are 0x5A

followed by 0xA5. If the exact message is not received, the device will not enter the

power-down state.

CS should be placed in a HIGH state after sending the Deep Power-down mode

sequence. To exit the power-down state, CS should be brought LOW. After leaving the

power-down state, CS can once again be used as the chip selection function.

6.5.10 Read version function ID

A new command 0xFE was included with SC18IS604 as a diagnostic tool when bringing

up the bridge to verify SPI parameters are correct. This command places a version string

in the SPI read buffer. The string contains the part number and a version string. The

interrupt pin is set and the version string can be read with command 0x06. The string is in

the form “SC18IS604 1.0.0”

The total length is 16 bytes and includes a 00h null terminator. Values in the read buffer

past the null terminator remain from the previous operation. The example above yields

these hex values in the first 16 locations in the read buffer: 0x53 0x43 0x31 0x38 0x49

0x53 0x36 0x30 0x34 0x20 0x31 0x2e 0x30 0x2e 0x30 0x00

SC18IS604

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© NXP B.V. 2021. All rights reserved.

Product data sheet

Rev. 1.0 — 22 September 2021

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