SC18IS602B Просмотр технического описания (PDF) - NXP Semiconductors.

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SC18IS602B

I²C-bus to SPI bridge

NXP Semiconductors. 

NXP Semiconductors

SC18IS602/602B/603

I2C-bus to SPI bridge

the Function ID. There is no restriction on the number or combination of Slave Selects that

can be enabled for an SPI message. If more than one SSn pin is enabled at one time, the

user should be aware of possible contention on the data outputs of the SPI slave devices.

Table 3. Function ID 01h to 0Fh

7

6

5

4

0

0

0

0

3

SS3[1]

2

SS2[2]

1

SS1

0

SS0

[1] SS3 does not exist in the SC18IS603.

[2] SS2 does not exist in the SC18IS602 and SC18IS603. Only SC18IS602B supports this function.

The data on the SPI port will contain the same information as the I2C-bus data, but without

the slave address and Function ID. For example, if the message shown in Figure 7 is

transmitted on the I2C-bus, the SPI bus will send the message shown in Figure 8.

write to buffer

S

SLAVE ADDRESS W A

FUNCTION

ID

A

DATA 1

A

Fig 7. I2C-bus message

A DATA n A P

002aac448

SPI data

DATA 1

DATA n

002aac451

Fig 8. SPI message

The SC18IS602/602B/603 counts the number of data bytes sent to the I2C-bus port and

will automatically send this same number of bytes to the SPI bus. As the data is

transmitted from the MOSI pin, it is also read from the MISO pin and saved in the data

buffer. Therefore, the old data in the buffer is overwritten. The data in the buffer can then

be read back.

If the data from the SPI bus needs to be returned to the I2C-bus master, the process must

be completed by reading the data buffer. Section 8 gives an example of an SPI read.

7.1.4 Read from buffer

A read from the data buffer requires no Function ID. The slave address with the R/W bit

set to a ‘1’ will cause the SC18IS602/602B/603 to send the buffer contents to the I2C-bus

master. The buffer contents are not modified during the read process.

S SLAVE ADDRESS R A DATA 1 A

A DATA n NA P

002aac449

Fig 9. Read from buffer

A typical write and read from an SPI EEPROM is shown in Section 8.

SC18IS602_602B_603_4

Product data sheet

Rev. 04 — 11 March 2008

© NXP B.V. 2008. All rights reserved.

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