參數(shù)資料
型號(hào): AT30TS750-XM8-T
廠商: ATMEL CORP
元件分類(lèi): 溫度/濕度傳感器
英文描述: DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 3Cel, SQUARE, SURFACE MOUNT
封裝: 3 X 3 MM, GREEN, PLASTIC, MSOP-8
文件頁(yè)數(shù): 29/52頁(yè)
文件大小: 1369K
代理商: AT30TS750-XM8-T
Atmel AT30TS750 [Preliminary]
Figure 9-1.
Command Loading
SCL
SDA
ACK
FROM
SLAVE
START
BY
MASTER
2
1
MSB
3
16
7
5
49
8
ADDRESS BYTE
COMMAND BYTE
23
16
7
5
49
8
0
1
A
0
ACK
FROM
SLAVE
MSB
0
C7
C6
C5
C4
C3
C2
C1
C0
9.1
Copy Nonvolatile Registers to Volatile Registers
The Copy Nonvolatile Registers to Volatile Registers command allows the contents of the
Nonvolatile Configuration Register, Nonvolatile TLOW Limit Register, and Nonvolatile THIGH Limit
Register to be copied into the Configuration Register, TLOW Limit Register, and THIGH Limit
Register. The copy process is automatically performed upon power-up or reset, but the Copy
Nonvolatile Registers to Volatile Registers command provides the ability to re-copy the data
registers if needed.
To copy the contents of the nonvolatile data registers into the volatile data registers, the Master
must first initiate a START condition followed by the AT30TS750’s device address byte
(1001AAA0 where “AAA” corresponds to the hard-wired A2-0 address pins).
After the
AT30TS750 has received the proper address byte, the device will send an ACK to the Master.
The Master must then send the command byte of B8h for the Copy Nonvolatile Registers to
Volatile Registers operation. After the command byte of B8h has been sent, the AT30TS750 will
send another ACK to the Master. After the Master has subsequently issued a STOP condition,
the AT30TS750 will begin the internally self-timed copy operation. The copy process will take
place in a maximum time of tCOPYR during which time the NVRBSY bit in the Configuration
Register will indicate that the nonvolatile registers are busy. If the Master issues a repeated
START condition instead of a STOP condition, the AT30TS750 will abort the copy operation and
the contents of the volatile data registers will not be changed.
The Copy Nonvolatile Registers to Volatile Registers command will be ignored and no operation
will be performed under the following conditions: the nonvolatile registers are already busy (the
NVRBSY bit of the Configuration Register is in the logic “1” state), the volatile and nonvolatile
registers are currently locked (the RLCK bit of the Nonvolatile Configuration Register is in the
logic “1” state), or the volatile and nonvolatile registers are permanently locked down (the
RLCKDWN bit of the Nonvolatile Configuration Register is in the logic “1” state). However, the
device will still respond with an ACK to indicate that it received the command byte even though
the copy process will not be performed.
8749A-DTS-03/11
35
R
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