EM1537WP10-001

Programmable Timers And Oscillators Overview

The EM1537WP10-001 is a low-power integrated circuit designed for analog quartz wristwatches with bipolar stepping motors. It operates on a 32 kHz crystal oscillator and consumes approximately 100 nA typ. at 1.5V within a 1.2 to 3.6 V supply range. This specific version (001) supports a 3.0 V supply, features a motor pulse period of 2 seconds, a pulse width of 3.906 ms, and a chopping ratio of 4/8 at 2048 Hz. It includes integrated programmable capacitors and a debounced RESET input.

Programmable Timers And Oscillators Feature Summary

• Low power CMOS technology with typical consumption of 100 nA at 1.5V
• Integrated 32 kHz quartz oscillator with adjustable trimmer capacitance (3-30 pF)
• Programmable motor drive parameters via metal mask: period, width, and chopping ratio
• Fully debounced RESET input for accurate time setting and power saving

Programmable Timers And Oscillators Applications

• Analog quartz wristwatches
• Driver circuits for bipolar stepping motors
• Battery-operated timekeeping devices

Programmable Timers And Oscillators Procurement Notes

Verify the complete part number including the three-digit customer version suffix (e.g., -001). Confirm the die thickness requirement, as WP10 indicates a 10 mil (250um) waffle pack delivery form. Ensure compatibility with the specified 3.0 V supply voltage configuration defined in version 001.

Programmable Timers And Oscillators Selection Notes

Select this component for applications requiring ultra-low current consumption in analog watch movements. The metal-mask programmable parameters (pulse width, period, chopping) must be finalized during design, as they cannot be changed post-fabrication. Verify that the operating temperature range of -10°C to +60°C meets the environmental requirements.

Programmable Timers And Oscillators Part Context

The EM1537 series consists of multiple versions differentiated by supply voltage ranges and motor drive configurations. Version 001 is specifically configured for the higher voltage range (up to 3.6 V) with distinct timing parameters compared to lower voltage variants like 016 or 026.

Programmable Timers And Oscillators Replacement Considerations

No direct public substitutes are listed. Replacement requires matching the metal-mask programmed parameters (period, width, chopping) and supply voltage range, which may necessitate custom ordering from the manufacturer.

Programmable Timers And Oscillators FAQ

What is the function of the MTEST pad?

The MTEST pad serves as a bidirectional port. In normal operation, it outputs a 32 Hz or 512 Hz signal for frequency tuning. If connected to Vp, it activates a fast motor test mode with specific short periods.

How is the oscillator frequency adjusted?

The oscillator frequency can be adjusted using an external trimmer capacitor (CTR) connected to the OSCIN pad, with an integrated on-chip trimmable capacitance range of 3 to 30 pF.

What happens when the RESET input is activated?

Pulling the RESET input to Vp resets the frequency dividers and disables motor pulses. The reset is fully debounced with a delay between 7.8 ms and 23.4 ms.