TLC59108F Datasheet, PDF (15/27 Pages) Texas Instruments – 8-BIT FM+ I2C BUS LED DRIVER

TLC59108F
www.ti.com .................................................................................................................................................................................................. SLDS162 – MARCH 2009
Sub-addresses are programmable through the I²C bus. Default power-up values are 92h, 94h, 98h and the
device(s) will not acknowledge these addresses right after power-up (the corresponding SUBx bit in MODE1
register is equal to 0).
Once sub-addresses have been programmed to their right values, SUBx bits need to be set to 1 in order to have
the device acknowledging these addresses (MODE1 register).
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 10 describes the LED All Call I²C Bus Address Register.
Table 10. ALLCALLADR – LED All Call I²C Bus Address Register Addresses 11h) Bit Description
ADDRESS
REGISTER
BIT
SYMBOL ACCESS⁽¹⁾
VALUE DESCRIPTION
7:5
AC[7:5]
R
100 ⁽²⁾
Reserved
11h
ALLCALLADR
4:1
AC[4:1]
R/W
1000⁽²⁾ ALLCALL I²C bus address
0
AC[0]
R
0 ⁽²⁾
Reserved
(1) R = read, W = write
(2) Default value
The LED All Call I²C-bus address allows all the TLC59108Fs 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 (MODE1 register), 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 TLC59108F in a reset condition until V_CC has
reached V_POR. At this point, the reset condition is released and the TLC59108F 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 t_W. The TLC59108F 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 011 with the R/W bit set to 0 (write) is sent by the I²C bus
master.
3. The TLC59108F 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.
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): TLC59108F
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