OM6272,598 NXP Semiconductors, OM6272,598 Datasheet - Page 6

• Manufacturer Part Number: OM6272,598
• Description: DEMO BOARD UART TO I2C
• Manufacturer: NXP Semiconductors

Specifications of OM6272,598

• Main Purpose: Interface, I2C Master to UART
• Embedded: No
• Utilized Ic / Part: SC18IM700
• Primary Attributes: UART to I2C Master/GPIO Bridge, 4-Bit LED Dimmer
• Secondary Attributes: Graphic User Interface
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Other names: 568-3512; 935282853598; OM6272

Philips Semiconductors
AN10397_1
Application note
Fig 3. ‘Read after Write’ command format
S CHAR.
SLAVE ADR.
+ W
The command begins with an ‘S’ character as the first byte, the second byte specifies the
I
set to a logic 0. The third byte indicates the number of data bytes in the message (DATA 1
to DATA N), and the last byte ended with the ‘P’ character.
To turn on and blink the LED, the host would send a message to the SC18IM700 as
follows: S C0 07 11 97 80 00 40 55 FA P.
Once the SC18IM700 receives this message from host it will translate and will send the
same message through the I
If the host wishes to read the PCA9531 internal registers to make sure they are correctly
set after the host has written to them, the ‘Read after Write’ command can be used for that
purpose. The format for the ‘Read after Write’ command is as shown in
Using the first example the host sends the following message to the SC18IM700:
SC18IM will send the message to PCA9531, then will read seven bytes from PCA9531
and sends them to the host automatically. The host will receive the following byte from
SC18IM700 through its UART port:
The host can also ask SC18IM700 to automatically send an I
information to the host after SC18IM700 has sent the host’s message to an I
The host can do this by sending a ‘Register Read’ command to read the I2Cstatus register
after any normal I
following message to SC18IM700:
Once the message is sent to the I
the I2C_OK (hex code 0xF0) status to the host. See Table 9 of the data sheet for other
I2C Status Code.
Upon receiving the I2C_OK status the host can send another message to SC18IM700.
2
C-bus slave address of the I
11 97 80 00 40 55 FA
S C0 07 11 97 80 00 40 55 FA S C1 07 P
S C0 07 11 97 80 00 40 55 FA P R 0A P
OF BYTES
NUMBER
2
C-bus message. Using the above example, the host would send the
DATA 1
Rev. 01 — 5 December 2005
2
How to use the SC18IM700 to control any I
2
C-bus to the PCA9531. The LED should be now blinking.
C-bus device, where ‘W’ is the least significant bit and it is
2
DATA N
C-bus device at address 0xC0, SC18IM700 will send
S CHAR.
SLAVE ADR. + R
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
2
C-bus’ transaction status
OF BYTES
NUMBER
AN10397
Figure
2
P CHAR.
C-bus device
2
C-bus slave.
3.
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