pimoroni AS7343 14-Channel Light / Color Sensor Breakout - STEMMA QT / Qwiic

AI context

Dense context for pasting into a model prompt — addresses, pinout, voltages, tolerances and the vendor's reference circuit.

BOARD: Adafruit product 6477, the AS7343 14-Channel Light / Color Sensor Breakout - an ams OSRAM AS7343 multi-spectral sensor in an OLGA-8 package (3.1 x 2 x 1 mm) that contains 25 photodiodes covering 11 overlapping visible bands plus near infrared, a clear channel and a flicker channel, 14 channels in total. The breakout adds a dual-output regulator (AP7312-3.3/1.8), a BSS138 level shifter, decoupling, a white illumination LED wired to the sensor's own LED driver, a green power LED and two JST-SH STEMMA QT / Qwiic sockets. Pimoroni resells it as SKU ADA6477 at 15.75 GBP as measured; Adafruit is the maker.
ADDRESSES: I2C 0x39, fixed - ams OSRAM lists 0x39 as the slave address for both AS7343 order codes and the board has no address jumper, so two of these need a bus multiplexer.
PINOUT: 6 pads on JP1. Pad 1 = VIN (power in; the fab file calls the net VCC), pad 2 = GND, pad 3 = SCL, pad 4 = SDA, pad 5 = GPIO (the sensor's own open-drain GPIO pin), pad 6 = INT (open-drain interrupt). The two STEMMA QT sockets (CONN3, CONN4) carry the same four nets, each pad 1 GND, pad 2 VCC, pad 3 SDA, pad 4 SCL. Both STEMMA sockets are one bus, not two.
SUPPLY: VIN takes 3 V to 5 V; U1 (AP7312-3.3/1.8) makes 3.3 V for the level shifter's high side and the LEDs, and 1.8 V for the sensor. The AS7343's own supply is 1.7 V to 1.98 V (1.8 V typical) with an absolute maximum of 1.98 V on VDD - it is a 1.8 V part and 3.3 V on the VDD pin would destroy it, which is why the regulator and the level shifter are on the board. Current: 210 uA typical active, 280 uA maximum; 40 uA typical idle; 0.7 uA typical in sleep.
LOGIC LEVEL: the host side follows VIN, 3 to 5 V; the sensor side is 1.8 V, its SCL/SDA threshold is VIH 1.26 V and VIL 0.54 V. The digital pins (SCL, SDA, GPIO, INT) are rated -0.3 V to 3.6 V absolute maximum and the LDR pin -0.3 V to 3.6 V, so the 1.8 V sensor will survive a 3.3 V host only through the shifter that is fitted.
REFERENCE CIRCUIT: as built, from the fab file. X1 is the AS7343 (its footprint is named AS7341 while its value is AS7343). C2 10 uF on VIN, C4 10 uF on the 3.3 V output, C3 10 uF and C1 0.1 uF on the 1.8 V rail next to the sensor. Q2 is the BSS138 shifter; R3 is a four-resistor 10 kOhm pack with one resistor from VCC to SCL, one from 1.8 V to the sensor's SCL, one from VCC to SDA and one from 1.8 V to the sensor's SDA, so both sides of the bus idle high. R1 10 kOhm feeds the green ON LED and SJ1 is the closed-wire jumper in series with it, which is the trace the guide says to cut. LED1, the white illumination LED, sits between VCC and the sensor's LDR pin, which is a current sink - the LED has no series resistor of its own because the AS7343's LED driver sets the current in software.
TRAPS: the vendor's pinouts prose says the on-board regulator converts 3-5 V to 3 V for the sensor, but the fab file puts the sensor on the 1.8 V output of the AP7312-3.3/1.8 and the ams OSRAM datasheet's absolute maximum on VDD is 1.98 V, so the 1.8 V figure is the one to trust. The address is fixed at 0x39 both by the datasheet's ordering table and by the guide. INT and GPIO are open-drain outputs with no pull-ups fitted on those two lines, so each needs a pull-up on the host side to be read. The white LED and the power LED both draw from the 3.3 V rail. The sensor is not a camera: it returns channel counts, and flicker detection has its own register path.