AT45DB321E-SHF-T Detailed explanation of pin function specifications and circuit principle instructions（228 ）
The AT45DB321E-SHF-T is a model of serial flash memory manufactured by Microchip Technology. It is based on the Atmel brand, which was acquired by Microchip Technology. This specific model features a 32M-bit density and comes with a 3.3V Power supply requirement. It's used primarily for embedded systems to store data in a non-volatile manner.
Package Type:
The AT45DB321E-SHF-T comes in a SOIC-8 (Small Outline Integrated Circuit, 8 pins) package type, meaning it has 8 pins. The specifications of the pins, their functions, and the application guidelines are crucial for understanding the operation of this chip in a circuit.
Here’s a detailed description of the pin functions for the AT45DB321E-SHF-T flash memory:
Pin Number Pin Name Pin Function 1 CS Chip Select. Active low input pin used to select the device for communication. 2 DO Data Out. This pin is used to output data from the flash memory to the host during read operations. 3 WP Write Protect. This pin, when driven low, prevents write operations to the device. 4 GND Ground. The reference ground pin for the device. 5 VCC Power Supply. Provides the 3.3V power to the chip. 6 CLK Clock . Provides the clock signal for synchronous communication. 7 DI Data In. This pin is used to input data from the host during write operations. 8 RESET Reset. Used to reset the device to its default state. A low signal on this pin resets the device.Detailed Pin Function Specifications:
CS (Chip Select): This pin enables or disables the chip for communication. When low, the chip is selected for communication, and when high, the chip is deselected. DO (Data Out): This is the output data pin. During read operations, data from the memory is transmitted out through this pin. It operates in synchronous mode with the clock signal. WP (Write Protect): This pin can be used to enable or disable the write protection feature. When low, write operations are allowed. When high, write protection is activated, and the device cannot be written to. GND (Ground): Provides a common ground reference for the device. It connects to the ground of the system. VCC (Power Supply): Supplies the necessary power for the chip, typically operating at 3.3V. It provides power for internal circuits like memory cells, control logic, and clock management. CLK (Clock): This is the clock input for synchronous communication. It provides timing for data input and output. The chip operates based on the rising edge of this clock signal. DI (Data In): This is the data input pin. It is used to send data into the flash memory during write operations. RESET (Reset): This pin is used to reset the device. A low signal on this pin resets the chip to its default configuration, which can be useful for initializing the device after power-up.Frequently Asked Questions (FAQ)
What is the operating voltage for the AT45DB321E-SHF-T? The AT45DB321E-SHF-T operates with a voltage range of 2.7V to 3.6V, typically powered by a 3.3V supply. How do I interface the AT45DB321E-SHF-T with a microcontroller? The AT45DB321E-SHF-T can be interfaced with a microcontroller using its SPI pins: Chip Select (CS), Clock (CLK), Data In (DI), and Data Out (DO). What is the maximum clock frequency for the AT45DB321E-SHF-T? The maximum clock frequency for the AT45DB321E-SHF-T is 66 MHz in standard SPI mode. Can the AT45DB321E-SHF-T be used for data logging? Yes, the AT45DB321E-SHF-T is commonly used in embedded systems for data logging due to its non-volatile memory and high data density. How do I perform a write operation on the AT45DB321E-SHF-T? To write data to the AT45DB321E-SHF-T, you need to send the write command through the SPI interface (using DI), while keeping the chip selected (CS low) and providing the appropriate clock signal. What is the purpose of the WP pin? The WP (Write Protect) pin prevents accidental writes to the memory. When held high, write operations are disabled. How does the reset pin work on the AT45DB321E-SHF-T? The RESET pin, when driven low, resets the chip to its default state. It is used for initializing the device or recovering from an error state. Is the AT45DB321E-SHF-T compatible with 5V logic levels? No, the AT45DB321E-SHF-T operates with 3.3V logic levels and is not recommended to interface directly with 5V logic systems without level shifting. What is the storage capacity of the AT45DB321E-SHF-T? The AT45DB321E-SHF-T has a storage capacity of 32Mbits (4MB). Can the AT45DB321E-SHF-T be used in wear leveling? The AT45DB321E-SHF-T does not natively support wear leveling, but it can be used in applications where wear leveling is implemented in software. How long does it take to erase a sector in the AT45DB321E-SHF-T? A full sector erase operation takes about 200ms. What happens if I apply incorrect voltage to the VCC pin? Applying an incorrect voltage to the VCC pin could cause malfunction or permanent damage to the device. Is it necessary to use the RESET pin during power-up? The RESET pin is not required during power-up, but it is used to initialize the chip after power is applied to ensure it is in a known state. What is the write cycle time for the AT45DB321E-SHF-T? The write cycle time for the AT45DB321E-SHF-T is approximately 1 ms for page programming. Can the AT45DB321E-SHF-T be used for bootloader applications? Yes, the AT45DB321E-SHF-T is suitable for bootloader applications in embedded systems, providing a secure storage location for firmware. Can I use the AT45DB321E-SHF-T for high-speed data transfer? Yes, the AT45DB321E-SHF-T supports high-speed data transfer up to 66 MHz with its SPI interface. What is the minimum clock frequency for the AT45DB321E-SHF-T? The minimum clock frequency for the AT45DB321E-SHF-T is 1 MHz. Can I share the CS line with multiple devices? Yes, the CS line can be shared with multiple SPI devices, but each device must be selected individually during communication. How can I check if the AT45DB321E-SHF-T is functioning correctly? You can check the device status by reading the status register, which provides information about the readiness of the device for the next operation. What is the data retention period for the AT45DB321E-SHF-T? The AT45DB321E-SHF-T provides a data retention period of 20 years at 25°C.If you need any further clarifications, feel free to ask!
