TPS929160-Q1
ZHCSNG0 – APRIL 2023
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IOUTA0[5:0]
REFRANGE[1:0]
2-bit range selection
OUTA0
OUTA1
I(FULL_RANGE)
K(REF)
×512
6-bit DAC
CHA0
CHA1
×256
×128
×64
IOUTA1[5:0]
6-bit DAC
Recommended
CREF
IOUTXn[5:0]
6-bit DAC
REF
V(REF)
Vbg
1.235V
1.235V
OUTXn
RREF
CHXn
Analog blocks
图 7-1. Output Current Setting
The internal current reference, I(FULL_RANGE), is generated based on the I(REF) multiplied by factor K(REF) to
provide the full range current reference for each OUTXn channel. The K(REF) is programmable by 2-bit register
REFRANGE with four different options. Use the following equation to calculate the I(FULL_RANGE)
.
V
(REF)
I(FULL _RANGE)
=
ìK(REF)
R(REF)
(1)
where
•
•
V(REF) = 1.235 V typically
K(REF) = 64, 128, 256, or 512 (default)
The following table lists the recommended resistor values of R(REF) and amplifier ratios of K(REF)
.
表 7-1. Reference Current Range Setting
FULL RANGE CURRENT (mA)
REFRANGE
K(REF)
R(REF) = 6.34 kΩ
R(REF) = 8.45 kΩ
R(REF) = 12.7 kΩ
R(REF) = 31.6 kΩ
11b(default)
10b
512
256
128
64
100
50
75
50
25
20
10
5
37.5
01b
25
18.75
9.375
12.5
6.25
00b
12.5
2.5
Place the R(REF) resistor as close as possible to the REF pin with an up to 2.2-nF ceramic capacitor in parallel to
improve the noise immunity. The off-board R(REF) setup is not allowed due to the concern of instability reference
current. TI recommends a 1-nF ceramic capacitor in parallel with R(REF)
.
7.3.2.2 64-Step Programmable High-Side Constant-Current Output
TPS929160-Q1 has 16 channels of high-side current sources. Each channel has its own enable configuration
register ENOUTXn. Setting ENOUTXn to 1 enables the channel output; clearing the register to 0 disables the
channel output. To completely turn off the channel current, the user can clear channel enable bit ENOUTXn to 0.
Upon power up, ENOUTXn is automatically reset to 0 to avoid unwanted blinking.
Each OUTXn channel supports individual 64-step programmable current setting, also known as dot correction
(DC). The DC feature can be used to set binning values for output LEDs or to calibrate the LEDs to achieve high
brightness homogeneity based on external visual system to further save binning cost. The 6-bit register IOUTXn
sets the current independently, where X is the channel group from A to H, n is the channel number 0 or 1 in each
group. Use the following equation to calculate the OUTXn current.
Copyright © 2023 Texas Instruments Incorporated
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Product Folder Links: TPS929160-Q1
English Data Sheet: SLVSG60
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