The MAX7315 is an I2C-/SMBus-compatible serial interfaced peripheral that provides microprocessors with 8 I/O ports. Each I/O port can be individually configured as either an open-drain current-sinking output rated at 50mA at 5.5V, or a logic input with transition detection. A ninth port can be used for transition detection interrupt or as a general-purpose output. The outputs are capable of directly driving LEDs, or providing logic outputs with external resistive pullup up to 5.5V. PWM current drive is integrated with 8 bits of control. Four bits are global control and apply to all LED outputs to provide coarse adjustment of current from fully off to fully on in 14 intensity steps. Each output then has individual 4-bit control, which further divides the globally set current into 16 more steps. Alternatively, the current control can be configured as a single 8-bit control that sets all outputs at once. The MAX7315 is pin and software compatible with the PCA9534 and PCA9554(A). Each output has independent blink timing with two blink phases. All LEDs can be individually set to be on or off during either blink phase, or to ignore the blink control. The blink period is controlled by a register. The MAX7315 supports hot insertion. All port pins, the INT output, SDA, SCL, and the slave address inputs ADO-2 remain high impedance in power-down (V+ = 0V) with up to 6V asserted upon them.
The MAX7315 is an I2C/SMBus‑compatible serial peripheral that provides eight configurable I/O ports plus a ninth interrupt/output pin. Each port can operate as an open‑drain current‑sinking output (50 mA, 5.5 V) or a logic input with transition detection, and supports per‑port 4‑bit PWM LED intensity control.
The device operates from 2 V to 3.6 V, offers up to 64 selectable I2C addresses, and includes hot‑insertion protection, low standby current, and a temperature range of –40 °C to +125 °C. It is supplied in a thin 3 mm × 3 mm QFN package.
| Operating Supply Voltage (V+) | 2 V to 3.6 V |
|---|---|
| Maximum Port Output Current | 50 mA per port (5.5 V rated) |
| Standby Current | 1.2 µA typ, 3.3 µA max |
| Operating Temperature Range | -40 °C to +125 °C |
| Package | Thin QFN 3 mm × 3 mm × 0.8 mm |
Each I/O port can sink up to 50 mA while the supply voltage is up to 5.5 V.
The MAX7315 can be configured to one of 64 possible I2C addresses.
Yes, the device supports hot insertion.
Typical standby current is 1.2 µA (maximum 3.3 µA).