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CAT1021ZD4E-25TE13 参数 Datasheet PDF下载

CAT1021ZD4E-25TE13图片预览
型号: CAT1021ZD4E-25TE13
PDF下载: 下载PDF文件 查看货源
内容描述: 监控电路,带有I2C串行2K位CMOS EEPROM ,手动复位及看门狗定时器 [Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset and Watchdog Timer]
分类和应用: 电源电路电源管理电路监控可编程只读存储器电动程控只读存储器电可擦编程只读存储器
文件页数/大小: 20 页 / 149 K
品牌: CATALYST [ CATALYST SEMICONDUCTOR ]
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CAT1021, CAT1022, CAT1023  
Acknowledge Polling  
memory array is protected and becomes read only. The  
CAT1021 will accept both slave and byte addresses,  
but the memory location accessed is protected from  
programming by the device’s failure to send an  
acknowledge after the first byte of data is received.  
Disabling of the inputs can be used to take advantage of  
the typical write cycle time. Once the stop condition is  
issuedtoindicatetheendofthehost’swriteopration, the  
CAT1021/22/23 initiates the internal write cycle. ACK  
pollingcanbeinitiatedimmediately.Thisinvolvesissuing  
the start condition followed by the slave address for a  
write operation. If the device is still busy with the write  
operation, no ACK will be returned. If a write operation  
hascompleted, anACKwillbereturnedandthehostcan  
then proceed with the next read or write operation.  
Read Operations  
The READ operation for the CAT1021/22/23 is initiated  
in the same manner as the write operation with one  
exception, the R/W bit is set to one. Three different  
READ operations are possible: Immediate/Current  
Address READ, Selective/Random READ and  
Sequential READ.  
WRITE PROTECTION PIN (WP)  
The Write Protection feature (CAT1021 only) allows the  
user to protect against inadvertent memory array  
programming. If the WP pin is tied to VCC, the entire  
Figure 10. Immediate Address Read Timing  
S
T
A
R
T
S
T
O
P
BUS ACTIVITY:  
MASTER  
SLAVE  
ADDRESS  
SDA LINE  
S
P
A
C
K
N
O
DATA  
A
C
K
SCL  
SDA  
8
9
8TH BIT  
DATA OUT  
NO ACK  
STOP  
Doc. No. 3009, Rev. K  
12  
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