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DLPA2005 Datasheet(PDF) 21 Page - Texas Instruments

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Part # DLPA2005
Description  Power Management and LED/Lamp Driver IC
PDF  55 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DLPA2005 Datasheet(HTML) 21 Page - Texas Instruments

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From light sensor
From host
From temperature sensor
To host
SW4
SW5
SENS1
VINA/3
VLED/3
SENS2
CMP_OUT
PWM_IN
AFE_SEL[3:0]
AFE_GAIN [1:0]
AFE
MUX
DLPA2005
www.ti.com
DLPS047B – SEPTEMBER 2014 – REVISED OCTOBER 2015
7.3.9 Measurement System
The measurement system is composed of a 10:1 analog multiplexer (MUX), a programmable-gain amplifier, and
a comparator. It works together with the DPP processor to provide:
•
White-point correction (WPC) by independently adjusting the RGB LED currents after measuring the
brightness of each color with an external light sensor
•
A measurement of the:
–
Battery voltage
–
LED forward voltage
–
Exact LED current
–
Temperature as derived by measuring the voltage across an external thermistor
Figure 10 shows a block diagram of the measurement system.
Figure 10. Block Diagram of the Measurement System
Table 2. Recommended Configuration of the AFE for Different Input Selections
RECOMMENDED GAIN SETTING
RECOMMENDED SETTING OF
AFE_SEL[3:0]
SELECTED INPUT
AFE-GAIN[1:0]
AFE_CAL_DIS BIT
0x00h
SENS2
0x01h (1x)
Setting has no effect on measurement
0x01h
VLED
0x01h (1x)
Setting has no effect on measurement
0x02h
VINA
0x01h (1x)
Setting has no effect on measurement
0x03h
SENS1
0x01h (1x)
Setting has no effect on measurement
Set to 1 if sense voltage is >100 mV.
0x04h
RLIM_K
0x03h (18x)
Otherwise set to 0 (default)
Set to 1 if sense voltage is >200 mV.
0x05h
SW4
0x02h (9.5x)
Otherwise set to 0 (default)
Set to 1 if sense voltage is >200 mV.
0x06h
SW5
0x02h (9.5x)
Otherwise set to 0 (default)
Set to 1 if sense voltage is >200 mV.
0x07h
SW6
0x02h (9.5x)
Otherwise set to 0 (default)
0x08h
No connect
N/A
N/A
0x09h
VREF
0x01h (1x)
Setting has no effect on measurement
Copyright © 2014–2015, Texas Instruments Incorporated
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