LED171596ARSLR datasheet(22/153 Pages) TI1

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VLED

VDDIO

VDD

STATE

RESET

STANDBY

EN pin

EN_BACKLIGHT[0]

HS0-3

LED0-23

DEVICE

STARTUP

NORMAL

LED171596A

SNVSAY2 – OCTOBER 2017

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Device Functional Modes (continued)

7.4.1 Reset

The device is in reset when the EN pin is low for tDISABLE time. I

2C/SPI interfaces are not active, and all the LED

drivers are disabled.

7.4.2 Device Start-Up

The supplies VDD, VDDIO and VLED should be applied according to where (t1

≥ t2 ≥ 0 ms) provided that VDD >

VDDIO. The timing interval t3 is dependent on the rise time of VLED supply where VLED is up and stable (LED

Vf + VSAT volts) prior to EN set high. After EN pin goes high the LED171596A begins device start-up, which takes

tEN to complete. This includes checking the state of the address and IFSEL pins and loading the default

configuration values from EPROM. If thermal shutdown is asserted the EPROM is not loaded until the TSD

condition is cleared. The I2C and SPI interfaces are not available in this state.

Figure 18. Start-Up Sequence Diagram

7.4.3 Standby

In standby the LED171596A is ready to be configured by the host with SPI or I2C interfaces. All user accessible

registers can be read or written as applicable. If the EN pin goes low, the device exits to SHUTDOWN state.

7.4.4 Normal

In normal mode the LED matrix sequencer and LED drivers are enabled. LEDs are illuminated in this state, and

LED fault detection is active. If the EN_BACKLIGHT bit is written to 0 or if a TSD faults occur, the device exits

back to STANDBY state. If the EN pin goes low for tDISABLE time, the device will exit to SHUTDOWN state. All

brightness, current and sloper registers may be modified in this state. Avoid changes to matrix sequence

configuration registers to avoid any visual artifacts. See Programming for more details.

7.4.5 Shutdown

The LED171596A should be shut-down according to where EN_BACKLIGHT (bit) is set low prior to EN pin set

low (t1

≥ t2 ≥ t3 ≥ 0 ms) provided that VDD > VDDPOR when EN pin set low. In SHUTDOWN the LED drivers are

disabled. The device is shut down and proceeds to RESET state.

LED171596ARSLR Datasheet(PDF) 22 Page - Texas Instruments

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