LP55231 Datasheet, PDF (34/53 Pages) Texas Instruments – LP55231 Programmable 9-Output LED Driver

LP55231
SNOSCR5 – MARCH 2013
www.ti.com
• These bits are used for storing an 8-bit temperature reading acquired from the internal temperature sensor.
This register is a read-only register. Temperature reading is stored in 8-bit two's complement format — see
the table below.
TEMPERATURE READ bits
11010111
11011000
...
11111110
11111111
00000000
00000001
00000010
...
01011000
01011001
Temperature interpretation (typ.) °C
−41
−40
...
−2
−1
0
1
2
...
88
89
40 TEMPERATURE WRITE
• 40 — Bits [7:0] TEMPERATURE
• These bits are used for storing an 8-bit temperature reading acquired from an external sensor, if such a
sensor is used. Temperature reading is stored in 8-bit two's complement format, like in 3F TEMPERATURE
READ register.
• When writing temperature data outside the range of the temperature compensation: Values greater than 89°C
will be set to 89°C; values less than −39°C will be set to −39°C.
41 LED TEST CONTROL
• LED test control register
• 41 — Bit [7] EN_LEDTEST_ADC
• Writing this bit high (1) fires single LED test conversion. LED test measurement cycle is 2.7 milliseconds.
• 41 — Bit [6] EN_LEDTEST_INT
• 1 = interrupt signal will be sent to the INT pin when the LED test is accomplished.
• 0 = no interrupt signal will be sent to the INT pin when the LED test is accomplished.
• Interrupt can be cleared by reading STATUS/INTERRUPT register 3A.
• 41 — Bit [5] CONTINUOUS_CONV
• 1 = continuous LED test measurement. Not active in power-save mode.
• 0 = continuous conversion is disabled.
• 41 — Bits [4:0] LED__TEST_CTRL
• These bits are used for choosing the LED driver output to be measured. V_DD , INT-pin and charge-pump
output voltage can be measured, also.
LED_TEST_CTRL bits
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001 to 01110
01111
Measurement
D1
D2
D3
D4
D5
D6
D7
D8
D9
Reserved
VOUT
34
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