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| 型號： | ADT7462ACPZ-500RL7 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 4Cel, SQUARE, SURFACE MOUNT |
| 封裝： | 5 X 5 MM, LFCSP-32 |
| 文件頁數(shù)： | 11/88頁 |
| 文件大小： | 836K |
| 代理商： | ADT7462ACPZ-500RL7 |
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ADT7462
Rev. 2 | Page 19 of 88 | www.onsemi.com
WRITE OPERATIONS
The SMBus specification defines several protocols for different
types of read and write operations. The ones used in the ADT7462
are discussed below. The following abbreviations are used in the
diagrams:
S – Start
P – Stop
R – Read
W – Write
A – Acknowledge
A – No Acknowledge
The ADT7462 uses the following SMBus write protocols.
Send Byte
In this operation, the master device sends a single command
byte to a slave device as follows:
1.
The master device asserts a start condition on SDA.
2.
The master sends the 7-bit slave address followed by the
write bit (low).
3.
The addressed slave device asserts an ACK on SDA.
4.
The master sends a command code.
5.
The slave asserts an ACK on SDA.
6.
The master asserts a stop condition on SDA to end the
transaction.
For the ADT7462, the send byte protocol is used to write a
register address to RAM for a subsequent single byte read from
the same address. This operation is shown in Figure 28.
SLAVE
ADDRESS
REGISTER
ADDRESS
SW A
A P
24
13
5
6
05569
-0
18
Figure 28. Setting a Register Address for a Subsequent Read
If it is required to read data from the register immediately after
setting up the address, the master can assert a repeat start
condition immediately after the final ACK and carry out a
single byte read without asserting an intermediate stop
condition.
Write Byte
In this operation, the master device sends a command byte and
one data byte to the slave device as follows:
1.
The master device asserts a start condition on SDA.
2.
The master sends the 7-bit slave address followed by the
write bit (low).
3.
The addressed slave device asserts an ACK on SDA.
4.
The master sends a command code.
5.
The slave asserts an ACK on SDA.
6.
The master sends a data byte.
7.
The slave asserts an ACK on SDA.
8.
The master asserts a stop condition on SDA to end the
transaction.
SLAVE
ADDRESS
SLAVE
ADDRESS
SW A
DATA
AP
A
24
13
5
8
7
6
05
569
-0
19
Figure 29. Single Byte Write to a Register
Block Write
In this operation, the master device writes a block of data to a
slave device. The start address for a block write must be set
previously. In the case of the ADT7462, this is done by a send
byte operation to set a RAM address. The user writes the
number of registers to be written to in the block read command
to the #Bytes bits of the Configuration 0 register.
1.
The master device asserts a start condition on the SDA.
2.
The master sends the 7-bit slave address followed by the
write bit (low).
3.
The addressed slave device asserts an ACK on the SDA.
4.
The master sends a command code that tells the slave
device to expect a block write. The ADT7462 command
code for a block write is 0xA0 (1010 0000).
5.
The slave asserts an ACK on SDA.
6.
The master sends the data bytes (the number of data bytes
sent is written to the #Bytes bits of the Configuration 0
register).
7.
The slave asserts an ACK on SDA after each data byte.
8.
The master sends a packet error checking (PEC) byte.
9.
The ADT7462 checks the PEC byte and issues an ACK,
if correct. If incorrect (NO ACK), the master resends the
data bytes.
10. The master asserts a stop condition on SDA to end the
transaction.
SW A
A
ADATA 1 AA
AP
DATA 2 A DATA
32
PEC
SLAVE
ADDRESS
COMMAND
0xA0
BLOCK
WRITE
BYTE
COUNT
1
2
3
4
5
678
9
10 11 12
055
69-
020
Figure 30. Block Write to ADT7462
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| ADT7462ACPZ-5RL7 | 功能描述:監(jiān)控電路 FLX H/WRE MON IC SRV RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| ADT7462ACPZ-R7 | 功能描述:監(jiān)控電路 FLX H/WRE MON IC SRV RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| ADT7462ACPZ-REEL | 功能描述:監(jiān)控電路 FLX H/WRE MON IC SRV RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| ADT7462ACPZ-REEL7 | 功能描述:IC TEMP/VOLT MONITOR 32-LFCSP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應商設備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
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