BQ4285S-SB2

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The BQ4285S-SB2 is a high-precision timing and clock chip designed to provide a broad range of solutions for clocking and timing applications. This device is designed to operate in both real-time clock (RTC) and manual operation modes while utilizing an external quartz oscillator reference and implementing technology that provides +/-50ppm accuracy. As with other real-time clocks, the BQ4285S-SB2 is typically used for tasks such as time and frequency regulation, data acquisition, device control, and time-stamped event recording.

At the heart of the BQ4285S-SB2 is a 32kHz quartz crystal or ceramic resonator oscillator that provides the timebase for the chip. Due to the internal high-order loop filter, the crystal oscillator provides clean, consistent, and stable reference time that is accurate to within +/-50ppm. This crystal oscillator is used to drive two main system bus clocks: a high-speed (6–40MHz) clock and a low-speed (32kHz) clock. These two clocks in turn control a variety of other peripheral clocks, such as an alarm clock (32kHz), an increment clock (1Hz or 32kHz), and a paging clock (3–13kHz).

The BQ4285S-SB2 also features a wide range of features that make it an ideal choice for RTC applications. For instance, the device offers an adjustable auto-calibration (AAC) feature that allows the chip to compensate for temperature and aging effects. The AAC feature can be set to operate in either manual or automatic modes, allowing for up to +/- 50ppm accuracy. Additionally, the device supports a programmable interrupt controller that can be used to generate periodic notices, alarms, and other important functions. Furthermore, the device provides a selectable output level that can be used to drive up to ten external outputs.

The BQ4285S-SB2 also incorporates a number of advanced power management features. In order to reduce power consumption, the device implements an adjustable power-down mode that automatically shuts down power to parts of the chip not currently in use. This feature can reduce total system power draw by up to 80%. Additionally, the device offers a low-power timer (LPT) mode that allows the chip to execute low-power timer tasks while remaining in a low-power sleep state. This feature can drastically reduce the amount of power consumed by a system that requires periodic checking or monitoring of external events. Finally, the chip also features a sleep/wake-up mode that powers down most of the chip while allowing certain functions, such as the RTC, to continue operating.

The BQ4285S-SB2 is an ideal choice for a variety of embedded applications. Its combination of high accuracy, low power consumption, adjustable precision calibration, and advanced power management make it an ideal choice for applications where absolute accuracy and reliability are paramount. Additionally, the device’s wide range of externally configurable parameters make it an ideal choice for many applications where flexibility and ease of integration are important considerations.

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