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參數(shù)資料
| 型號： | 24LC32 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 32K I 2 C⑩ Serial EEPROM in ISO Micromodule |
| 中文描述： | 32K的的I 2 C⑩在ISO微型模塊串行EEPROM |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 474K |
| 代理商： | 24LC32 |
24LC32A MODULE
DS21225A-page 8
1997 Microchip Technology Inc.
7.0
ACKNOWLEDGE POLLING
Since the device will not acknowledge during a write
cycle, this can be used to determine when the cycle is
complete (this feature can be used to maximize bus
throughput). Once the stop condition for a write com-
mand has been issued from the master, the device ini-
tiates the internally timed write cycle. ACK polling can
be initiated immediately. This involves the master send-
ing a start condition followed by the control byte for a
write command (R/W = 0). If the device is still busy with
the write cycle, then no ACK will be returned. If the
cycle is complete, then the device will return the ACK
and the master can then proceed with the next read or
write command. See Figure 7-1 for ow diagram.
FIGURE 7-1:
ACKNOWLEDGE POLLING
FLOW
8.0
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 one. There are three basic types
of read operations: current address read, random read,
and sequential read.
8.1
Current Address Read
The 24LC32A contains an address counter that main-
tains the address of the last word accessed, internally
incremented by one. Therefore, if the previous access
(either a read or write operation) was to address n (n is
any legal address), the next current address read oper-
ation would access data from address n + 1. Upon
receipt of the slave address with R/W bit set to one, the
24LC32A issues an acknowledge and transmits the
eight bit data word. The master will not acknowledge
the transfer but does generate a stop condition and the
24LC32A discontinues transmission (see Figure 8-1).
8.2
Random Read
Random read operations allow the master to access
any memory location in a random manner. To perform
this type of read operation, rst the word address must
be set. This is done by sending the word address to the
24LC32A as part of a write operation (R/W bit set to 0).
After the word address is sent, the master generates a
start condition following the acknowledge. This termi-
nates the write operation, but not before the internal
address pointer is set. Then the master issues the con-
trol byte again but with the R/W bit set to a one. The
24LC32A will then issue an acknowledge and transmit
the eight bit data word. The master will not acknowl-
edge the transfer but does generate a stop condition
which causes the 24LC32A to discontinue transmis-
sion (see Figure 8-2).
FIGURE 8-1:
CURRENT ADDRESS READ
Send
Write Command
Send Stop
Condition to
Initiate Write Cycle
Send Start
Send Control Byte
with R/W = 0
Did Device
Acknowledge
(ACK = 0)?
Next
Operation
NO
YES
S
P
S
T
A
R
T
S
T
O
P
DATA BYTE
CONTROL BYTE
A
C
K
N
O
A
C
K
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
0
1
0 0 0
1
0
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 24LC32A/P | 功能描述:電可擦除可編程只讀存儲器 4kx8 - 5V - 2.5V RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 24LC32A/P | 制造商:Microchip Technology Inc 功能描述:IC EEPROM SERIAL 32K 24LC32 DIP8 |
| 24LC32A/S15K | 制造商:Microchip Technology Inc 功能描述:32K, 4K X 8, 2.5V SERIAL DIE IN WAFFLE PK - Gel-pak, waffle pack, wafer, diced wafer on film |
| 24LC32A/SM | 功能描述:電可擦除可編程只讀存儲器 4kx8 - 5V - 2.5V RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 24LC32A/SM | 制造商:Microchip Technology Inc 功能描述:EEPROM SERIAL 32K 24LC32 SOIC8 |
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