參數(shù)資料
型號(hào): AT30TS750-XM8-T
廠商: ATMEL CORP
元件分類: 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
文件頁數(shù): 31/52頁
文件大?。?/td> 1369K
代理商: AT30TS750-XM8-T
Atmel AT30TS750 [Preliminary]
Figure 9-3.
Copy Volatile Registers to Nonvolatile Registers
SCL
SDA
ACK
FROM
SLAVE
START
BY
MASTER
2
1
MSB
3
16
7
5
49
8
ADDRESS BYTE
COMMAND BYTE
STOP
BY
MASTER
23
16
7
5
49
8
0
1
A
0
0100100
0
ACK
FROM
SLAVE
MSB
0
10. SMBus Features and I2C General Call
10.1
SMBus Alert
The AT30TS750 utilizes the ALERT pin to support the SMBus Alert function when the Alarm
Thermostat Mode is set to the Interrupt Mode (the CMP/INT bit of the Configuration Register is
set to “1”) and the ALERT pin polarity is set to active low (the POL bit of the Configuration
Register is set to “0”). The AT30TS750 is a slave-only device, and normally, slave devices on the
SMBus cannot signal to the Master that they want to communicate. However, the AT30TS750
uses the SMBus Alert function (the ALERT pin) to signal to the Master that it wants to
communicate.
Several SMBus Alert pins from different slave devices can be connected to a common SMBus
Alert input on the Master. When the SMBus Alert input on the Master is pulled low by one of the
slave devices, the Master can perform a specialized read operation from the slave devices to
determine which device sent the SMBus Alert signal.
The specialized read operation is known as an SMBus Alert Response Address (ARA) and
requires that the Master first initiate a START condition followed by the SMBus ARA code of
00011001. The slave device that generated the SMBus Alert signal will respond to the Master
with an ACK. After sending the ACK, the slave device will then output its own device address
(1001AAA for the AT30TS750 where “AAA” corresponds to the hard-wired A2-0 address pins) on
the bus. Since the device address is seven bits long, the remaining eighth bit (the LSB) is used
as an indicator to notify the Master which temperature limit caused the alarm (the LSB will be a
logic “1” if the THIGH limit was met or exceeded, and the LSB will be a logic “0” if the TLOW limit
was exceeded).
The SMBus ARA can activate several slave devices at the same time; therefore, if more than one
slave responds, standard SMBus arbitration rules apply and the device with the lowest address
wins the arbitration. The device winning the arbitration will clear its SMBus Alert output after it
has responded to the SMBus ARA and provided its device address. All other devices with higher
addresses do not generate an ACK and continue to hold their SMBus Alert outputs low until
cleared. The Master will continue to issue SMBus ARA sequences until all slave devices that
generated an SMBus Alert signal have responded and cleared their SMBus Alert outputs.
8749A-DTS-03/11
37
R
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