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TCA6507 Datasheet(PDF) 7 Page - Texas Instruments |
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TCA6507 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 32 page www.ti.com B7 B4 B3 B2 B1 B0 B5 B6 TCA6507 LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 After the command byte is received, the I2C master starts sending data bytes. The first data byte goes into the internal register defined by the command byte. Bit B4 in the command byte is used to determine the programming mode. If B4 is low, all data bytes are written to the register defined by B0, B1, B2, and B3. If B4 is high, the last four bits of the command byte are automatically incremented after the byte is written, and the next data byte is stored in the corresponding register. Registers are written in the sequence shown in Table 3. Once the Initialization register (register 10) is written to, the command byte returns to 0 (Select0 register). Registers 11 to 15 are reserved, and a command byte that references these registers is not acknowledged by the TCA6507. The upper three bits (B7–B5) of the command byte must be programmed as zeroes for proper operation. If a Stop condition occurs after the command byte is received, the TCA6507 stores the command byte and then remains idle until the I2C master sends the next operation. Figure 6. Control Register Bits Table 2. Command Byte BIT FUNCTION B7 Reserved. Must be programmed as 0. B6 Reserved. Must be programmed as 0. B5 Reserved. Must be programmed as 0. B4 Auto increment B3 Register address 3 B2 Register address 2 B1 Register address 1 B0 Register address 0 Table 3. Control Register Description CONTROL REGISTER BITS COMMAND POWER-UP REGISTER PROTOCOL BYTE (HEX) DEFAULT B3 B2 B1 B0 0 0 0 0 0x00 Select0 Read/write byte 0000 0000 0 0 0 1 0x01 Select1 Read/write byte 0000 0000 0 0 1 0 0x02 Select2 Read/write byte 0000 0000 0 0 1 1 0x03 Fade-On Time Read/write byte 0100 0100 0 1 0 0 0x04 Fully-On Time Read/write byte 0100 0100 0 1 0 1 0x05 Fade-Off Time Read/write byte 0100 0100 0 1 1 0 0x06 First Fully-Off Time Read/write byte 0100 0100 0 1 1 1 0x07 Second Fully-Off Time Read/write byte 0100 0100 1 0 0 0 0x08 Maximum Intensity Read/write byte 1111 1111 1 0 0 1 0x09 One Shot / Master Intensity Read/write byte 0000 1111 1 0 1 0 0x10 Initialization Write byte N/A 1 0 1 1 0x11 Reserved N/A N/A 1 1 0 0 0x12 Reserved N/A N/A 1 1 0 1 0x13 Reserved N/A N/A 1 1 1 0 0x14 Reserved N/A N/A 1 1 1 1 0x15 Reserved N/A N/A Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Link(s): TCA6507 |
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