AS7058 datasheet(25/199 Pages) AMSOSRAM

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AS7058

Functional description

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Figure 22: LED driver block diagram

The LED driver includes a VCSEL safety protection. This block consists of a PMOS VCSEL

supply switch, a watchdog, and two comparators for short circuit detection. The block is

activated if the current range for the LED driver is set to 25 mA (LED_IRNGX = 0). The

VCSEL_MODE register provides the selection of the monitored LED pad.

The major events monitored by the protection block are short circuits to VSS and VCSELS

pins as well as monitoring the on-time. If the LED on-time is larger than the watchdog time, an

interrupt is generated, and the VCSEL power switch is switched off automatically.

In case the block detects any error, the measurement is immediately stopped (e.g. watchdog

event) and an interrupt is released. The STATUS_VCSEL status register shows the source of

the error (a short to VSS, a short to VCSELS, or a watchdog event). If no VCSEL is used, the

protection feature can be switched off with the VCSEL_CFG register.

VLED

(2.7V – 5.5V)

LED1

LED2

LED3

LED4

LED5

LED6

LED7

LED8

VCSELA

VCSELS

VCSEL

Power

Switch

LED Driver 2

8 bit; 4 current ranges

25 mA; 150 mA;

225 mA; 300 mA

VSCEL Safety

Protection

LED Driver 1

8 bit; 4 current ranges

25 mA; 150 mA;

225 mA; 300 mA

VSCEL Safety

Protection

AS7058

PGND2

PGND1

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