ams OSRAM AS1181 Eight-Channel LED/VCSEL Driver
ams OSRAM AS1181 Eight-Channel LED/VCSEL Driver is a highly integrated self-contained driver for near-to-eye applications such as Augmented Reality (AR) and Virtual Reality (VR) glasses. The AS1181 incorporates extended safety monitoring functions to ensure safe operation for the eyes. The safety monitors comprise LED short detection, LED overcurrent protection, LED open detection, LED on-time monitor, as well as temperature shutdown and a built-in self-test (BIST).
The ams OSRAM AS1181 Eight-Channel LED/VCSEL Driver is configurable through a serial wire interface (I²C or I3C) with an interrupt and delivers two strobe/PWM inputs to synchronize illumination with up to two external cameras for binocular eye tracking systems. The LED current is separately programmable per channel, and it can drive up to two IR LEDs per current sink with a minimum ON-time of 10μs and a maximum current of 66mA per channel.
General-purpose LED driving applications can be supported via a direct PWM input applied at the strobe pin, and it can drive RGB or white LEDs, considering a maximum forward voltage of 5V.
The AS1181 is available in a tiny wafer-level chip-scale package (WLCSP) with a 0.4mm pitch and a 2.9mm x 1.75mm x 0.5mm (L x W x H) size.
Features
- Enhanced safety monitors:
- High side over current detection (Anode)
- High side LP node short detection (Anode)
- Low side open/short LED detection (Cathode)
- Built-in self-test (BIST)
- Illumination time monitor
- Over and low-temperature shutdown
- Tiny WL-CSP 28 package with 0.4mm pitch
- 2.9mm x 1.75mm x 0.5mm (L x W x H) sized package
- Dual trigger input to start and synchronize illumination with two eye tracking cameras
Applications
- Eye/face/hand tracking in AR/VR and XR glasses
- Iris recognition
- General-purpose LED driver with enhanced safety features
DemoBoard
ams OSRAM AS1181 Demoboard
Includes a simple PC GUI software to allow configuration of the AS1181 and test different modes.
Block Diagram
