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DS28DG02: 2Kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog
Figure 1. Block Diagram
WPZ
CSZ
SCK
SI
SO
SPI
Communication
Interface
Memory
Function Buffer
and Control
PIO Function
Control
12
PIOn
64-bit Unique
Registration
Number
2Kb
EEPROM Array
Voltage Monitors
2
V C C
WDI
Watchdog
Timer
and Power
Distribution
2
V BAT
GND
BATA
VCLA
X1
X2
Real-Time
Clock, Calendar
and RTC Alarm
WDA
CLKA
Alarm Control
Logic, RSTZ
Debounce
ALMZ
WDOZ
RSTZ
The PIO configuration and setup of RTC/calendar with alarm are part of the Detailed Register Description . This
section also includes specifics of the Multifunction Control/Setup register, which enables/disables several device
functions, and the Alarm/Status register. For detailed information on the operation of the V CC monitor/power-fail
reset and the battery monitor see the Monitoring Functions section. The SPI Interface description explains the
communication protocol for memory and register access and the use of the watchdog function. The PIO
Read/Write Access section illustrates the behavior of the PIOs, in particular the address generation and timing in
low- and high-current mode.
The DS28DG02 memory map (Figure 2) begins with 256 bytes of general-purpose user EEPROM, organized as
four blocks of 64 bytes. Additional EEPROM is set aside to store power-on defaults for PIO state (high, low, in
output mode), data direction (in, out), read-inversion (true, false), port output type (push-pull, open-drain), and
output mode (high current, low current). Once powered up, the PIO settings can be overwritten through SRAM
registers without affecting the power-on defaults. PIO state, direction, and read-inversion can be set for individual
ports. The output type is set for groups of four PIOs and the selected output mode applies to all PIOs in output
mode. The RTC/calendar, associated Alarm registers and the Multifunction Control/Status registers are kept
nonvolatile through battery backup. Write-protection, if enabled, is available for all four EEPROM blocks, blocks 2
and 3 only, or block 3 only and for all writeable registers from address 120h and higher.
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DS28DG02EVKIT 功能描述:存储器 IC 开发工具 RoHS:否 制造商:STMicroelectronics 产品:Reference Boards 工具用于评估:M24LR64-R 存储容量:64 kbit 存储类型:EEPROM 工作电源电压:1.8 V to 5.5 V
DS28DG02G-3C+ 功能描述:电可擦除可编程只读存储器 2Kb SPI 电可擦除可编程只读存储器 w/PIO RTC/Rst/Bat Mtr/Wtdg RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
DS28DG02G-3C+T 功能描述:电可擦除可编程只读存储器 2Kb SPI 电可擦除可编程只读存储器 w/PIO RTC/Rst/Bat Mtr/Wtdg RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
DS28E01-100 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:带SHA-1引擎保护的1K位1-Wire EEPROM
DS28E01-100_12 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1Kb Protected 1-Wire EEPROM with SHA-1 Engine
DS28E01-100+ 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
DS28E01G-100+R 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:1K-Bit Protected 1-Wire EEPROM with SHA-1 Engine
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