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参数资料
| 型号： | DS1388Z-3 |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | XO, clock |
| 英文描述： | The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each |
| 中文描述： | REAL TIME CLOCK, PDSO8 |
| 封装： | 0.150 INCH, SOIC-8 |
| 文件页数： | 17/18页 |
| 文件大小： | 381K |
| 代理商： | DS1388Z-3 |
Acknowledge Polling
Since the DS1388 does not acknowledge during an
EEPROM write cycle, acknowledge polling can be used
to determine when the cycle is complete (this feature
can be used to maximize bus throughput). Once the
master issues the STOP condition for a write command,
the DS1388 initiates the internally timed write cycle.
ACK polling can be initiated immediately. This involves
the master sending a START condition, followed by the
slave address byte for a write command (R/
W
= 0) to
the EEPROM. If the device is still busy with the write
cycle, then a NACK is returned. If the cycle is com-
plete, then the device returns the ACK and the master
can then proceed with the next read or write command.
The RTC registers in block 0 are accessible during an
EEPROM write cycle.
Read Operation
Read operations are initiated in the same way as write
operations with the exception that the R/
W
bit of the
slave address is set to 1. There are three basic types of
read operations: current address read, random read,
and sequential read.
Current Address Read
The DS1388 contains an address pointer that main-
tains the last address accessed, internally increment-
ed by 1. Therefore, if the previous access (either a
read or write operation) was to address n, the next cur-
rent address read operation would access data from
address n + 1. Upon receipt of the slave address with
the R/
W
bit set to 1, the DS1388 issues an acknowl-
edge and transmits the 8-bit data byte. The master
issues a NACK followed by a STOP condition, and the
DS1388 discontinues transmission.
Random Read
Random read operations allow the master to access any
memory location in a random manner. To perform this
type of read operation, first the word address must be
set. This is done by sending the word address to the
DS1388 as part of a write operation. After the word
address is sent, the master generates a START condi-
tion following the acknowledge. This terminates the write
operation, but not before the internal address pointer is
set. Then the master issues the slave address byte
again but with the R/
W
bit set to 1. The DS1388 then
issues an acknowledge and transmits the 8-bit data
byte. The master issues a NACK followed by a STOP
condition, and the DS1388 discontinues transmission.
Sequential Read
Sequential reads are initiated in the same way as a ran-
dom read except that after the DS1388 transmits the
first data byte, the master issues an acknowledge as
opposed to a STOP condition in a random read. This
directs the DS1388 to transmit the next sequentially
addressed 8-bit byte. To provide sequential reads, the
DS1388 contains an internal address pointer, which is
incremented by one at the completion of each opera-
tion. This allows the entire memory contents of the
block specified in the slave address to be serially read
during one operation. The master terminates the read
by generating a NACK followed by a STOP condition.
No page boundaries exist for read operations. When
the address pointer reaches the end of an EEPROM
block (FFh), the address pointer wraps to the beginning
(00h) of the same block.
The DS1388 can operate in the two modes illustrated in
Figure 8 and 9.
D
I
2
C RTC/Supervisor with Trickle Charger
and 512 Bytes EEPROM
____________________________________________________________________
17
A
XXXXXXXX
A
1101BBB
S
0
XXXXXXXX A XXXXXXXX A XXXXXXXX A P
<SLAVE
ADDRESS>
B = BLOCK SELECT
S = START
A = ACKNOWLEDGE
P = STOP
R/W = READ/WRITE OR DIRECTION BIT ADDRESS
<
DATA TRANSFERRED
(X + 1 BYTES + ACKNOWLEDGE)
<DATA (n + X)>
<DATA (n + 1)>
<DATA (n)>
<WORD
ADDRESS (n)>
Figure 8. Slave Receiver Mode (Write Mode)
A
XXXXXXXX
A
1101BBB
S
1
XXXXXXXX A XXXXXXXX A XXXXXXXX A P
<SLAVE
ADDRESS>
B = BLOCK SELECT
S = START
A = ACKNOWLEDGE
P = STOP
A = NOT ACKNOWLEDGE
R/W = READ/WRITE OR DIRECTION BIT ADDRESS
<
DATA TRANSFERRED
(X + 1 BYTES + ACKNOWLEDGE)
NOTE:
LAST DATA BYTE IS FOLLOWED BY
A NOT ACKNOWLEDGE (A) SIGNAL
<DATA (n + X)>
<DATA (n + 2)>
<DATA (n + 1)>
<DATA (n)>
Figure 9. Slave Transmitter Mode (Read Mode)
相关PDF资料 |
PDF描述 |
|---|---|
| DS1390-DS1393 | RIBBON CABLE, 34WAY, PER M; Cores, No. of:34; Conductor make-up:7/36AWG; Wire size, AWG:28AWG; Impedance:119R; Pitch:1.27mm; Voltage rating, AC:50V; Colour:Grey; Capacitance:70.5pF/m; Approval Bodies:UL; Approval category:Style RoHS Compliant: Yes |
| DS1390U-18 | RIBBON CABLE, 40WAY, PER M; Cores, No. of:40; Conductor make-up:7/36AWG; Wire size, AWG:28AWG; Impedance:119R; Pitch:1.27mm; Voltage rating, AC:50V; Colour:Grey; Capacitance:70.5pF/m; Approval Bodies:UL; Approval category:Style RoHS Compliant: Yes |
| DS1390 | Low-Voltage SPI/3-Wire RTCs with Trickle Charger |
| DS1392U-33 | Low-Voltage SPI/3-Wire RTCs with Trickle Charger |
| DS1391U-3 | IGBT Module; Continuous Collector Current, Ic:200A; Collector Emitter Saturation Voltage, Vce(sat):3.4V; Power Dissipation, Pd:1500W; Collector Current:200A; Collector Emitter Voltage, Vceo:1.2kV; Leaded Process Compatible:No RoHS Compliant: No |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1388Z-3+ | 功能描述:实时时钟 I2C RTC/Supervisor w/Trickle Charger 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 |
| DS1388Z-3+T&R | 制造商:Maxim Integrated Products 功能描述:2WIRE RTC 3V,SUPRVSR &EPROM PB-F TR - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC I2C W/CHARGER 8-SOIC |
| DS1388Z-3+T&R | 功能描述:实时时钟 I2C RTC/Supervisor w/Trickle Charger 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 |
| DS1388Z-33 | 功能描述:实时时钟 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 |
| DS1388Z-33+ | 功能描述:实时时钟 I2C RTC/Supervisor w/Trickle Charger 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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