TLC59208F_1 Datasheet, PDF (17/29 Pages) Texas Instruments – 8-BIT FM+ I2C BUS LED DRIVER

TLC59208F
www.ti.com .................................................................................................................................................................................................. SCLS715 – MARCH 2009
Only the 7 MSBs representing the I²C bus sub-address are valid. The LSB in SUBADRx register is a read-only
bit (0).
When SUBx is set to 1, the corresponding I²C bus sub-address can be used during either an I²C bus read or
write sequence.
LED All Call I²C Bus Address Register (ALLCALLADR)
Table 11 describes the LED All Call I²C Bus Address Register.
Table 11. ALLCALLADR – LED All Call I²C Bus Address Register Addresses 11h) Bit Description
ADDRESS
REGISTER
BIT
SYMBOL ACCESS⁽¹⁾
VALUE DESCRIPTION
7:1
11h
ALLCALLADR
0
AC[7:1]
AC[0]
R/W
R
1101 000⁽²⁾ ALLCALL I²C bus address
0 ⁽²⁾
Reserved
(1) R = read, W = write
(2) Default value
The LED All Call I²C bus address allows all the TLC59208Fs in the bus to be programmed at the same time
(ALLCALL bit in register MODE1 must be equal to 1 (power-up default state)). This address is programmable
through the I²C-bus and can be used during either an I²C bus read or write sequence. The register address can
also be programmed as a Sub Call.
Only the 7 MSBs representing the All Call I²C bus address are valid. The LSB in ALLCALLADR register is a
read-only bit (0).
If ALLCALL bit = 0, the device does not acknowledge the address programmed in register ALLCALLADR.
Power-On Reset
When power is applied to V_CC, an internal power-on reset holds the TLC59208F in a reset condition until V_CC has
reached V_POR. At this point, the reset condition is released and the TLC59208F registers and I²C bus state
machine are initialized to their default states causing all the channels to be deselected. Thereafter, V_CC must be
lowered below 0.2 V to reset the device.
External Reset
A reset can be accomplished by holding the RESET pin low for a minimum of tW. The TLC59208F registers and
I²C state machine will be held in their default state until the RESET input is once again high.
This input requires a pull-up resistor to V_CC if no active connection is used.
Software Reset
The Software Reset Call (SWRST Call) allows all the devices in the I²C bus to be reset to the power-up state
value through a specific I²C bus command. To be performed correctly, the I²C bus must be functional and there
must be no device hanging the bus.
The SWRST Call function is defined as the following:
1. A Start command is sent by the I²C bus master.
2. The reserved SWRST I²C bus address 1001 111 with the R/W bit set to 0 (write) is sent by the I²C bus
master.
3. The TLC59208F device(s) acknowledge(s) after seeing the SWRST Call address 1001 0110 (9Eh) only. If
the R/W bit is set to 1 (read), no acknowledge is returned to the I²C bus master.
4. Once the SWRST Call address has been sent and acknowledged, the master sends two bytes with two
specific values (SWRST data byte 1 and byte 2):
a. Byte1 = A5h: the TLC59208F acknowledges this value only. If byte 1 is not equal to A5h, the TLC59208F
does not acknowledge it.
b. Byte 2 = 5Ah: the TLC59208F acknowledges this value only. If byte 2 is not equal to 5Ah, the
TLC59208F does not acknowledge it.
If more than two bytes of data are sent, the TLC59208F does not acknowledge any more.
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): TLC59208F
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