AT24C08C

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AT24C08C is a 1,024words × 8 bits EEPROM(Electrically Erasable and Programmable Read-Only Memory) chip manufactured by Microchip Technology. This posting will provide the OSS-ECAL(Open Source Software for Electronic Components Abstraction Layer) for AT24C08C.
MCU interface : I2C

CAUTION:Please be sure to refer to the latest version of the Datasheet prior to actual design.

AT24C08C

General description

The AT24C08C provides 8,192 bits of Serial Electrically Erasable and Programmable Read-Only Memory (EEPROM) organized as 1,024 words of 8 bits each. The device’s cascading feature allows up to two devices (AT24C08C) to share a common Two-Wire bus. These devices are optimized for use in many industrial and commercial applications where low‑power and low‑voltage operations are essential. The devices are available in space-saving 8-lead SOIC, 8-lead TSSOP, 8-pad UDFN, 8-lead PDIP, 5-lead SOT23 and 8-ball VFBGA packages. All packages operate from 1.7V to 5.5V.

Feature

Low-Voltage Operation : V_CC = 1.7V to 5.5V
Internally Organized as 1,024 x 8 (8K)
Industrial Temperature Range : -40°C to +85°C
I²C-Compatible (Two-Wire) Serial Interface : 100 kHz Standard mode, 1.7V to 5.5V, 400 kHz Fast mode, 1.7V to 5.5V, 1 MHz Fast Mode Plus (FM+), 2.5V to 5.5V
Schmitt Triggers, Filtered Inputs for Noise Suppression
Bidirectional Data Transfer Protocol
Write-Protect Pin for Full Array Hardware Data Protection
Ultra Low Active Current (3 mA maximum) and Standby Current (6 μA maximum)
16-byte Page Write Mode : Partial page writes allowed
Random and Sequential Read Modes
Self-Timed Write Cycle Within 5 ms Maximum
ESD Protection > 4,000V
High Reliability : 1,000,000 write cycles, Data retention 100 years
Green Package Options (Lead-Free/Halide-Free/RoHS Compliant)
Die Sale Options: Wafer Form and Tape and Reel Available

OSS-ECAL specification

API Function

This product provides the following command API functions.

etSTS oAT24C08C_BYTE_WRITE( etCMP cmp, uint16 mem_adr, uint8 val )

Return value
Parameter IN

etSTS
etCMP cmp
uint16 mem_adr
uint8 val

OSS-ECAL status code
OSS-ECAL Components number codes
Memory address
Write data

Feature :
Command API function to write the value of val to the address specified by mem_adr.

Process :
1. Writes the value of val to the address specified in mem_adr.
2. Wait until measurement time iAT24C08C_WRITE_TIME[ms] has elapsed (return value eSTS_EXE while waiting).

Return value :
eSTS_FIN
eSTS_EXE
eSTS_ERR_PARAMETER
eSTS_ERR_HAL_I2C
eSTS_ERR_OTHERS_RUN
eSTS_ERR_I2C_OBJECT

NOTE :
iAT24C08C_WRITE_TIME[ms] Progress measurement is calculated from the Thread cycle that calls this API function, so please set the Thread cycle to THREAD_OSS_ECAL_PERIOD[ms].

etSTS oAT24C08C_PAGE_WRITE( etCMP cmp, uint16 mem_adr, uint16 len, uint8* buf )

Return value
Parameter IN

etSTS
etCMP cmp
uint16 mem_adr
uint16 len
uint8* buf

OSS-ECAL status code
OSS-ECAL Components number codes
Memory address
Number of bytes to write (Max 16)
Data buffer to write

Feature :
Command API function that writes values from buf[0] to buf[len-1] in order from the address specified in mem_adr.

Process :
1. Write values from buf[0] to buf[len-1] in order from the address specified in mem_adr.
2. Wait until measurement time iAT24C08C_WRITE_TIME[ms] has elapsed (return value eSTS_EXE while waiting).

Return value :
eSTS_FIN
eSTS_EXE
eSTS_ERR_PARAMETER
eSTS_ERR_HAL_I2C
eSTS_ERR_OTHERS_RUN
eSTS_ERR_I2C_OBJECT

NOTE :
If mem_adr + len > 0bXXXXXX1111, the addresses A4 to A8 are fixed and A0 to A3 are rolled over to 0bXXXXXX0000.
iAT24C08C_WRITE_TIME[ms] Progress measurement is calculated from the Thread cycle that calls this API function, so please set the Thread cycle to THREAD_OSS_ECAL_PERIOD[ms].

etSTS oAT24C08C_CURRENT_READ( etCMP cmp, uint8* rlt )

Return value
Parameter IN
Parameter OUT

etSTS
etCMP cmp
uint8* rlt

OSS-ECAL status code
OSS-ECAL Components number codes
Read data

Feature :
Command API function to read 1Byte value from the last Read or Write address +1 and save it to rlt.

Process :
1. Read 1Byte value from the last read or write address + 1 and save it to rlt.

Return value :
eSTS_FIN
eSTS_ERR_HAL_I2C
eSTS_ERR_OTHERS_RUN
eSTS_ERR_I2C_OBJECT

NOTE :
If mem_adr + len > 0b1111111111, the addresses is rolled over to 0b0000000000.

etSTS oAT24C08C_RANDOM_READ( etCMP cmp, uint16 mem_adr, uint8* rlt )

Return value
Parameter IN

Parameter OUT

etSTS
etCMP cmp
uint16 mem_adr
uint8* rlt

OSS-ECAL status code
OSS-ECAL Components number codes
Memory address
Read data

Feature :
Command API function that reads 1 Byte worth of value from the address specified in mem_adr and saves it to rlt.

Process :
1. Read 1Byte worth of value from the address specified in mem_adr and save it to rlt.

Return value :
eSTS_FIN
eSTS_ERR_PARAMETER
eSTS_ERR_HAL_I2C
eSTS_ERR_OTHERS_RUN
eSTS_ERR_I2C_OBJECT

NOTE :

etSTS oAT24C08C_SEQ_READ( etCMP cmp, uint16 mem_adr, uint16 len, uint8* buf )

Return value
Parameter IN

Parameter OUT

etSTS
etCMP cmp
uint16 mem_adr
uint16 len
uint8* buf

OSS-ECAL status code
OSS-ECAL Components number codes
Memory address
Number of bytes to read
Data buffer to read

Feature :
Command API function that reads sequentially from the address specified in mem_adr and saves from buf[0] to buf[len-1].

Process :
1. Read in order from the address specified in mem_adr and save from buf[0] to buf[len-1].

Return value :
eSTS_FIN
eSTS_ERR_PARAMETER
eSTS_ERR_HAL_I2C
eSTS_ERR_OTHERS_RUN
eSTS_ERR_I2C_OBJECT

NOTE :
If mem_adr + len > 0b1111111111, the addresses is rolled over to 0b0000000000.

etSTS oAT24C08C_WP_EN( etCMP cmp )

Return value
Parameter IN

etSTS
etCMP cmp

OSS-ECAL status code
OSS-ECAL Components number codes

Feature :
Command API function to write protect enable (write disable).

Process :
1. Write protect output as “Hi”.

Return value :
eSTS_FIN
eSTS_ERR_GPIO_OBJECT

NOTE :

etSTS oAT24C08C_WP_DIS( etCMP cmp )

Return value
Parameter IN

etSTS
etCMP cmp

OSS-ECAL status code
OSS-ECAL Components number codes

Feature :
Command API function to write protect disable (write enable).

Process :
1. Write protect output as “Low”.

Return value :
eSTS_FIN
eSTS_ERR_GPIO_OBJECT

NOTE :

Files

Folder^*	File	summary
AT24C08C_HALNAME/sample	sample.c (.cpp)	Sample Application Program
	sample.h	Sample Application Header
AT24C08C_HALNAME	oAT24C08C.c (.cpp)	OSS-ECAL Program for AT24C08C
	oAT24C08C.h	OSS-ECAL Header for AT24C08C
	oss_ecal.h	OSS-ECAL Common Header (Ver 01.01.01 or later)
	user_setting.c (.cpp)	Const and Table of User setting
	user_setting.h	Header of User setting
	oHAL_i2c_stm32f4.c	HAL Program for STM32Cube FW_F4
	oHAL_i2c_stm32f4.h	HAL Header for STM32Cube FW_F4
	readme.md	Readme
	OSS-ECAL Terms of Use.txt	OSS-ECAL Terms of Use

* For HALNAME, please refer to HAL Support.

HAL Support List

MCU/Board manufacturer	HAL	MCU*	Development environment*	HALNAME
Arduino	Arduino 1.8.6	ATmega2560 ATmega328P	Mega 2560 Rev3 Arduino Pro Mini 3.3V	ARDUINO
ARM	Mbed 6.17.0	STM32F401RETx	STM32 Nucleo-64 boards	MBED
Infineon	ModusToolbox HAL Cat1 2.4.3	CYBLE-416045-02	CY8CPROTO-063-BLE PSoC 6 BLE Prototyping Kit	ModusToolbox
NXP	MCUXpresso SDK iMXRT1051B_1052B ksdk2_0	CYBLE-416045-02	IMXRT1050-EVKB	iMXRT1051B1052B
STM	STM32Cube FW_F4 V1.27.1	STM32F401RETx	STM32 Nucleo-64 boards	STM32F4

* MCU and development environment at the time of development. Even if the same HAL is used, different MCUs and development environments may not work together.

OSS-ECAL Download

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HAL	Download　OSS-ECAL Ver
Arduino 1.8.6	Download AT24C08C_ARDUINO_010000.zip 15.33 KB 0 count
Mbed 6.17.0	Download AT24C08C_MBED_010000.zip 15.12 KB 0 count
ModusToolbox HAL Cat1 2.4.3	Download AT24C08C_ModusToolbox_010000.zip 15.40 KB 0 count
MCUXpresso SDK iMXRT1051B_1052B ksdk2_0	Download AT24C08C_iMXRT1051B1052B_010000.zip 15.55 KB 1 count
STM32Cube FW_F4 V1.27.1	Download AT24C08C_STM32F4_010000.zip 19.31 KB 2 count

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If you are unable to download the File, please contact us and let us know the model number and HAL type. We will send you the file as an email attachment.

Built-in How to

Please refer to the following to incorporate API functions into your user program.

Pin A2 should be set with the following code in user_setting.h.

// Device address Code bit2:A2
#define AT24C08C_1             0b00000000

For Infineon ModusToolbox HAL, set the I2C Timeout setting with the following code in user_setting.h. For details, see cyhal_i2c_master_write(), cyhal_i2c_master_read() Parameters timeout.

#define I2C_TIMEOUT             10U     // Timeout[ms]

For STM32Cube FW_F4 HAL, I2C Timeout time is 25ms.

Note :
For the following command API functions, the Timeout time varies depending on the Read/Write data length len.
etSTS oAT24C08C_PAGE_WRITE( etCMP cmp, uint16 mem_adr, uint16 len, uint8* buf )
etSTS oAT24C08C_SEQ_READ( etCMP cmp, uint16 mem_adr, uint16 len, uint8* buf )

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