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TLC59116IPWR Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza TLC59116IPWR
Descripción Electrónicos  16-CHANNEL Fm I2C-BUS CONSTANT-CURRENT LED SINK DRIVER
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TLC59116IPWR Datasheet(HTML) 11 Page - Texas Instruments

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Driver Output
Constant Current Output
Adjusting Output Current
140
120
80
40
0
0
500
1000
1500
2000
2500
3000
3500
4000
R
ext
W
100
TLC59116
www.ti.com .................................................................................................................................................... SLDS157B – FEBRUARY 2008 – REVISED JULY 2008
AI[2:0] = 110 is used when the LED drivers must be globally programmed with different settings during the same
I2C bus communication, for example, global brightness or blinking change.
AI[2:0] = 111 is used when individually and global changes must be performed during the same I2C bus
communication, for example, changing color and global brightness at the same time.
Only the five least significant bits D[4:0] are affected by the AI[2:0] bits.
When the Control register is written, the register entry point determined by D[4:0] is the first register that will be
addressed (read or write operation), and can be anywhere between 0 0000 and 1 1011 (as defined in Table 2).
When AI[2] = 1, the Auto-Increment flag is set and the rollover value at which the point where the register
increment stops and goes to the next one is determined by AI[2:0]. See Table 1 for rollover values. For example,
if the Control register = 1111 0100 (F4h), then the register addressing sequence will be (in hex):
14
→ ... → 1B → 00 → ... → 13 → 02 → ... → 13 → 02 → ... as long as the master keeps sending or
reading data.
In LED display applications, TLC59116 provides nearly no current variations from channel to channel and from
device to device. While IOUT ≤ 52 mA, the maximum current skew between channels is less than ±6% and less
than ±8% between devices.
TLC59116 scales up the reference current (Iref) set by the external resistor (Rext) to sink the output current (Iout) at
each output port. Table 11 shows the Configuration Code and discusses bits CM, HC, and CC[5:0]. The following
formulas can be used to calculate the target output current IOUT,target in the saturation region:
VREXT = 1.26 V × VG
Iref = VREXT/Rext, if another end of the external resistor Rext is connected to ground
IOUT,target = Iref × 15 × 3
CM – 1
Where Rext is the resistance of the external resistor connected to the REXT terminal, and VREXT is the voltage of
REXT, which is controlled by the programmable voltage gain (VG), which is defined by the Configuration Code.
The Current Multiplier bit (CM) sets the ratio IOUT,target/Iref to 15 or 5 (sets the exponent "CM – 1" to either 0 or
–1). After power on, the default value of VG is 127/128 = 0.992, and the default value of CM is 1, so that the ratio
IOUT,target/Iref = 15. Based on the default VG and CM:
VREXT = 1.26 V × 127/128 = 1.25 V
IOUT,target = (1.25 V/Rext) × 15
Therefore, the default current is approximately 52 mA at 360
Ω and 26 mA at 720 Ω. The default relationship
after power on between IOUT,target and Rext is shown in Figure 8.
Figure 8. IOUT,target vs Rext
Copyright © 2008, Texas Instruments Incorporated
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