BQ32000DR Structure, Technical Parameters, Layout Guidelines and Applications
27 February 2024
Ⅲ. Simplified schematic of BQ32000DR
Ⅳ. Technical parameters of BQ32000DR
Ⅴ. Layout guidelines for BQ32000DR
Ⅶ. How does the backup power of BQ32000DR work?
The BQ32000DR is a low-power microprocessor peripheral that provides a time clock and 100-year calendar with alarm function and battery power. Its other features include three maskable interrupt sources, a square wave output, and 114 bytes of general-purpose non-volatile memory. In this article, we will introduce the technical parameters, structure and layout of the BQ32000DR.
The BQ32000DR is a real-time clock (RTC) with an integrated trickle charger and automatic backup power. This device is unique in that it can use both capacitors and non-rechargeable batteries to power the backup power supply. In addition, the BQ32000DR has a calibration adjustment range of -63 ppm to +126 ppm, and this range is programmable, providing a high degree of flexibility for the user. The BQ32000DR's registers contain the STOP bit and the OF (oscillator fault) flag, which enable the host CPU to shut down the RTC oscillator. To ensure accurate timing, the time registers are typically updated once per second and all related registers are synchronized during this process. It is worth noting that the BQ32000DR also automatically applies leap year compensation, thus avoiding timing errors caused by improper leap year handling.
Replacements and equivalents:
• BQ32000D
• PCF8563T
The BQ32000DR usually contains the following parts:
1. Power management: The BQ32000DR is typically capable of operating in standby power mode to ensure that the time tracking function continues to be provided even if the main power supply is interrupted. In addition, it usually includes a low-power mode to further extend battery life.
2. Clock divider: The BQ32000DR includes a frequency divider that divides the high frequency signal generated by the crystal oscillator into a lower frequency, such as 1 Hz. This is done to reduce power consumption and improve system stability.
3. Interfaces: The BQ32000DR is usually equipped with interfaces to communicate with microcontrollers or other digital devices, such as I2C or SPI interfaces. These interfaces allow the user to read and set time information, as well as configure other features of the chip, thus providing great flexibility and convenience.
4. Crystal oscillator: The BQ32000DR incorporates an internal crystal oscillator which is responsible for generating a stable clock signal. The frequency of this signal is usually 32.768 kHz, which is very common in real-time clock chips because it is one of the standard frequencies for calculating time.
• BQ32000DR is manufactured by Texas Instruments.
• Its power supply voltage is 3V to 3.6V.
• Its mounting method is SMD or SMT.
• BQ32000DR belongs to the category of real time clock.
• BQ32000DR has 8 pins and comes in SOIC-8 package and tape and reel packaging.
• Its minimum and maximum operating temperatures are -40°C and 85°C, respectively.
• Its package length is 5mm(max), package width is 3.98mm(max), and package height is 1.5mm(max).
Taking BQ32000 as an example, the Vcc pin should be bypassed to GND using a low-ESR ceramic bypass capacitor with a minimum recommend value of 1-uF. This capacitor should be placed as close to the Vcc and GND pins as possible with thick trace or ground plane connection to the device GND pin. Locate the 32.768-kHz crystal oscillator as close as possible to the OSCI and OSCO pins. This will minimize stray capacitance.
• Medical equipment: In medical equipment, accurate time tracking is important for recording patient data, monitoring treatment processes, and coordinating operations between different devices. The BQ32000DR's built-in crystal oscillator generates a stable clock signal, ensuring accurate time tracking.
• Industrial automation: By integrating the BQ32000DR into industrial control systems, time synchronization between devices can be ensured. Since the BQ32000DR has a highly accurate and stable clock signal, it provides the system with an accurate and reliable time reference. In this way, individual devices can coordinate their work according to this reference, ensuring that scheduled tasks are performed at the correct point in time.
• Battery-powered devices: The BQ32000DR is suitable for battery-powered devices due to its low-power consumption characteristics. It utilizes an advanced low-power circuit design that allows it to consume almost no power in standby mode. This means that the BQ32000DR places little burden on the battery when the device is idle, effectively extending battery life.
• Counters and registers: The BQ32000DR incorporates sophisticated internal counters and registers for accurate time tracking and storage. The counter is incremented according to a clock signal that has been processed through a frequency division process, thus ensuring time accuracy. This mechanism allows the BQ32000DR to maintain accurate time counting even when the system is in sleep or low power mode. The registers, on the other hand, are used to store time and date information, including seconds, minutes, hours, days, months, years, and other key data. These registers not only provide an instant snapshot of the time, but also allow users to programmatically read and set the time to meet a variety of application requirements.
• Smart home: Taking the smart lighting system as an example, the BQ32000DR ensures that all lamps and lanterns are turned on or off at the same time, thus synchronizing the lights throughout the room. This not only provides users with a more comfortable lighting environment, but also helps save energy and reduce electricity bills. In addition, the BQ32000DR can also be widely used in smart home devices such as security cameras. By ensuring that cameras record or take photos at the same time, surveillance vulnerabilities caused by time desynchronization can be avoided. At the same time, the precise time stamp can also help users quickly locate the surveillance recordings within a specific time period, improving the efficiency and accuracy of security management.
• Consumer electronics: BQ32000DR is commonly used in consumer electronics, such as digital clocks, timers, and electronic calendars. For example, in digital clocks, the BQ32000DR provides stable clock signals and precise time counting to ensure accurate clock display. The BQ32000DR is able to maintain time accuracy even when the device is switched off or in the event of a power failure, because it has a built-in backup power supply and automatic switching mechanism. When the main power supply fails, the backup power supply will automatically take over to ensure that the clock continues to run without time deviation due to power problems.
The backup power of BQ32000DR can be realized by capacitor or non-rechargeable battery. In case of main power failure, the backup power supply will immediately take over automatically to ensure continuous and stable operation of the real-time clock. This automatic switchover to the backup power supply not only maintains the accuracy of the time display, but also greatly improves the reliability and stability of the entire device. The capacity and performance of the backup power supply determine the continuous running time of the real-time clock after the failure of the main power supply. Therefore, when choosing capacitors or batteries as the backup power supply, we need to make comprehensive considerations based on the power consumption of the equipment and the required continuous operation time. Capacitors usually have faster charging and discharging speeds and are suitable for short-term power interruptions, while batteries can provide stable power supply for a longer period of time and are suitable for occasions that require long-time backup.
Frequently Asked Questions
1. What are the key features of the BQ32000DR?
The BQ32000DR features a low supply current, wide operating voltage range, integrated crystal, automatic backup switchover, and battery backup.
2. What is the replacement and equivalent of BQ32000DR?
You can replace the BQ32000DR with BQ32000D, BQ32002DR, M41T82RM6F, MCP7940N-I/SN or PCF8563T.
3. What applications is the BQ32000DR suitable for?
The BQ32000DR is suitable for a wide range of applications requiring accurate timekeeping, such as industrial automation, consumer electronics, medical devices, and automotive systems.
