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參數(shù)資料
| 型號(hào)： | 24AA32A-P |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 32K 1.8V I 2 C O Serial EEPROM |
| 中文描述： | 32K的1.8VI 2二氧化碳串行EEPROM |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 79K |
| 代理商： | 24AA32A-P |
1996 Microchip Technology Inc.
Preliminary
DS21162B-page 7
24AA32A
5.0
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. Acknowledge
Polling (ACK) can be initiated immediately. This
involves the master sending 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 5-1 for flow
diagram.
FIGURE 5-1:
ACKNOWLEDGE POLLING
FLOW
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
6.0
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.
6.1
Current Address Read
The 24AA32A 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
24AA32A 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
24AA32A discontinues transmission (Figure 6-1).
6.2
Random Read
Random read operations allow the master to access
any memory location in a random manner. To perform
this type of read operation, first the word address must
be set. This is done by sending the word address to the
24AA32A as part of a write operation (R/W bit set to
zero). After the word address is sent, the master gener-
ates a start condition following the acknowledge. This
terminates the write operation, but not before the inter-
nal address pointer is set. Then the master issues the
control byte again but with the R/W bit set to a one. The
24AA32A will then issue an acknowledge and transmit
the 8-bit data word. The master will not acknowledge
the transfer but does generate a stop condition which
causes the 24AA32A to discontinue transmission
(Figure 6-2).
FIGURE 6-1:
CURRENT ADDRESS READ
S
P
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
S
T
A
R
T
CONTROL BYTE
DATA BYTE
S
T
O
P
A
C
K
N
O
A
C
K
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 24AA32ASC-I/S16K | 制造商:Microchip Technology Inc 功能描述:32K I2C SMARTCARD EE DIE IN WAFFLE PK - Gel-pak, waffle pack, wafer, diced wafer on film |
| 24AA32ASC-I/W16K | 制造商:Microchip Technology Inc 功能描述:32K I2C SMARTCARD EE WAFER - Gel-pak, waffle pack, wafer, diced wafer on film |
| 24AA32ASC-I/WF16K | 制造商:Microchip Technology Inc 功能描述:32K I2C SMARTCARD EE WFR ON FR - Gel-pak, waffle pack, wafer, diced wafer on film |
| 24AA32AT/SM | 功能描述:電可擦除可編程只讀存儲(chǔ)器 4kx8 RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 24AA32AT/SN | 功能描述:電可擦除可編程只讀存儲(chǔ)器 4kx8 RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
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