参数资料
| 型号： | ISL12027IV27AZ |
| 厂商： | Intersil |
| 文件页数： | 13/28页 |
| 文件大小： | 0K |
| 描述： | IC RTC/CALENDAR EEPROM 8-TSSOP |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 960 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，监控器，监视计时器 |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | I²C，2 线串口 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 电压 - 电源，电池： | 1.8 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-TSSOP |
| 包装： | 管件 |
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20
FN8232.8
August 12, 2010
Acknowledge Polling
Disabling of the inputs during non-volatile write cycles can
be used to take advantage of the typical 5ms write cycle
time. Once the stop condition is issued to indicate the end of
the master’s byte load operation, the ISL12027 initiates the
internal non-volatile write cycle. Acknowledge polling can
begin immediately. To do this, the master issues a start
condition followed by the Memory Array Slave Address Byte
for a write or read operation (AEh or AFh). If the ISL12027 is
still busy with the non-volatile write cycle, then no ACK will
be returned. When the ISL12027 has completed the write
operation, an ACK is returned and the host can proceed with
the read or write operation. Refer to the flow chart in
Figure 24. Note: Do not use the CCR Slave byte (DEh or
DFh) for Acknowledge Polling.
Read Operations
There are three basic read operations: Current Address
Read, Random Read and Sequential Read.
Current Address Read
Internally the ISL12027 contains an address counter that
maintains the address of the last word read incremented by
one. Therefore, if the last read was to address n, the next
read operation would access data from address n + 1. On
power-up, the 16 bit address is initialized to 0h. In this way, a
current address read immediately after the power on reset
can download the entire contents of memory starting at the
first location. Upon receipt of the Slave Address Byte with
the R/W bit set to one, the ISL12027 issues an
acknowledge, then transmits 8 data bits. The master
terminates the read operation by not responding with an
acknowledge during the ninth clock and issuing a stop
condition. Refer to Figure 23 for the address, acknowledge,
and data transfer sequence.
It should be noted that the ninth clock cycle of the read
operation is not a “don’t care.” To terminate a read operation,
the master must either issue a stop condition during the
ninth cycle or hold SDA HIGH during the ninth clock cycle
and then issue a stop condition.
S
T
A
R
T
S
T
O
P
SLAVE
ADDRESS
WORD
ADDRESS 1
DATA
A
C
K
A
C
K
A
C
K
SDA BUS
SIGNALS FROM
THE SLAVE
SIGNALS FROM
THE MASTER
0
A
C
K
WORD
ADDRESS 0
1
00 0 0 0 0 0
FIGURE 20. BYTE WRITE SEQUENCE
ADDRESS
10
6 BYTES
15
6 BYTES
ADDRESS = 5
ADDRESS POINTER ENDS
FIGURE 21. WRITING 12 BYTES TO A 16-BYTE MEMORY PAGE STARTING AT ADDRESS 10
AT ADDR = 5
WORD
ADDRESS 0
S
T
A
R
T
S
T
O
P
SLAVE
ADDRESS
WORD
ADDRESS 1
DATA
(n)
A
C
K
A
C
K
A
C
K
SDA BUS
SIGNALS FROM
THE SLAVE
SIGNALS FROM
THE MASTER
0
DATA
(1)
A
C
K
1
≤ n ≤ 16 FOR EEPROM ARRAY
1
≤ n ≤ 8 FOR CCR
1
00 0 0 0 0 0
FIGURE 22. PAGE WRITE SEQUENCE
ISL12027, ISL12027A
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相关代理商/技术参数 |
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|---|---|
| ISL12027IV27AZ-T | 功能描述:实时时钟 REAL TIME CLK/CLNDR W/EEPROM 2 92VSET RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| ISL12027IV27Z | 功能描述:实时时钟 REAL TIME CLK/CLNDR W/EEPROM 2 7VSET RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| ISL12027IV27Z-T | 功能描述:实时时钟 REAL TIME CLK/CLNDR W/EEPROM 2 7VSET 8 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| ISL12027IV30AZ | 功能描述:实时时钟 REAL TIME CLK/CLNDR W/EEPROM 3 09VSET RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| ISL12027IV30AZ-T | 功能描述:实时时钟 REAL TIME CLK/CLNDR W/EEPROM 3 09VSET RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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