S-35740C01I-K8T2U

Programmable Timers And Oscillators Overview

The S-35740C01I-K8T2U is a programmable interval timer IC designed for intermittent system operation. It generates fixed-cycle interrupt signals with user-settable frequency and duty ratio via a 2-wire I2C interface. The device features a built-in 32.768 kHz crystal oscillation circuit and a 24-bit timer that counts up every second. Key electrical parameters include an operating voltage range of 1.8 V to 5.5 V, typical current consumption of 0.2 μA (with ENBL high), and 1.7 μA (ENBL low). It operates within a temperature range of −40°C to +85°C and utilizes a TMSOP-8 package.

Programmable Timers And Oscillators Feature Summary

• Built-in 32.768 kHz quartz crystal oscillation circuit
• Programmable fixed-cycle interrupt signal output via I2C interface
• Ultra-low current consumption: 0.2 μA typ. (ENBL=H) and 1.7 μA typ. (ENBL=L)
• Wide operating voltage range: 1.8 V to 5.5 V
• 24-bit cumulative timer with 1-second count-up resolution

Programmable Timers And Oscillators Applications

• IoT communications devices
• Monitoring systems
• Security devices
• Battery-powered systems
• Energy harvesting systems

Programmable Timers And Oscillators Procurement Notes

Verify the specific ordering suffix K8T2U corresponds to the TMSOP-8 tape packing specification. Confirm environmental compliance requirements, as the U suffix indicates lead-free (Sn 100%) and halogen-free construction. Ensure the master controller supports the standard I2C protocol for register configuration.

Programmable Timers And Oscillators Selection Notes

Select this component when precise, low-power timing intervals are required without external crystals. The internal oscillator eliminates external capacitor tuning. Consider the 0.2 μA standby current for battery longevity. Verify that the I2C bus speed (up to 1 MHz) matches the host controller capabilities.

Programmable Timers And Oscillators Part Context

This part belongs to the S-35740 series of interval timer ICs from ABLIC Inc. The C01 designation specifies the use of a quartz crystal with CL = 6.0 pF. The I suffix denotes the industrial temperature grade (-40°C to +85°C). The K8T2U code identifies the TMSOP-8 package with tape-and-reel packaging.

Programmable Timers And Oscillators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should evaluate other ABLIC interval timers or general-purpose RTCs if pin compatibility is not required.

Programmable Timers And Oscillators FAQ

How is the fixed-cycle interrupt signal frequency configured?

The frequency and duty ratio are set by writing to the fixed-cycle interrupt signal setting register via the I2C interface. Users can select frequencies from 1 Hz to 1.024 kHz by setting specific bits in the register.

What is the function of the ENBL pin?

The ENBL pin controls the output of the INT pin. When ENBL is High, the INT pin outputs the fixed-cycle interrupt signal. When ENBL is Low, the INT pin output is fixed High, and the device enters a lower power state.

How does the device handle power-on initialization?

After power-on, the INT pin is fixed Low for approximately 0.5 seconds while the crystal oscillation stabilizes. The power-on detection circuit requires the supply voltage to rise from ≤0.2V to ≥1.8V within 10 ms for normal operation.