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| 型号： | ADT7463ARQZ-REEL7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/50页 |
| 文件大小： | 726K |
| 描述： | IC REMOTE THERMAL CTRLR 24-QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 500 |
| 系列： | dBCool® |
| 功能： | 风扇控制，温度监控器 |
| 传感器类型： | 内部和外部 |
| 感应温度： | -40°C ~ 120°C，外部传感器 |
| 精确度： | ±1.5°C（最小值） |
| 拓扑： | ADC，比较器，风扇速度计数器，多路复用器，寄存器库 |
| 输出类型： | SMBus? |
| 输出警报： | 无 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 120°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 带卷 (TR) |
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ADT7463
http://onsemi.com
11
Serial Bus Interface
Control of the ADT7463 is carried out using the serial
system management bus (SMBus). The ADT7463 is
connected to this bus as a slave device, under the control of
a master controller.
The ADT7463 has a 7bit serial bus address. When the
device is powered up with Pin 13 (PWM3/
ADDRESS ENABLE
) high, the ADT7463 has a default
SMBus address of 0101110 or 0x2E. The read/write bit must
be added to get the 8bit address. If more than one ADT7463
is used in a system, then each ADT7463 should be placed in
address select mode by strapping Pin 13 low on powerup.
The logic state of Pin 14 then determines the devices
SMBus address. The logic of these pins is sampled upon
powerup.
The device address is sampled and latched on the first
valid SMBus transaction, more precisely on the
lowtohigh transition at the beginning of the 8th SCL
pulse, when the serial bus address byte matches the selected
slave address. The selected slave address is chosen using the
address enable/address select pins. Any attempted changes
in the address will have no effect after this.
Table 5. ADDRESS SELECT MODE
Pin 13
State
Pin 14 State
Address
0
Low (10 kW to GND)
0101100 (0x2C)
0
High (10 kW Pullup)
0101101 (0x2D)
1
Dont Care
0101110 (0x2E) (Default)
Figure 13. Default SMBus Address = 0x2E
ADDR_SEL
ADT7463
14
13
PWM3/
ADDR_EN
10 kW
ADDRESS = 0x2E
V
CC
Figure 14. SMBus Address = 0x2C (Pin 14 = 0)
ADDR_SEL
ADT7463
14
13
PWM3/
ADDR_EN
10 kW
ADDRESS = 0x2C
Figure 15. SMBus Address = 0x2D (Pin 14 = 1)
ADDR_SEL
ADT7463
14
13
PWM3/
ADDR_EN
10 kW
ADDRESS = 0x2D
V
CC
Figure 16. Unpredictable SMBus Address if Pin 13
is Unconnected
UNCONNECTED! CAN
CAUSE UNPREDICTABLE
ADDRESSES.
NOTE THAT IF THE ADT7463 IS PLACED INTO ADDRESS
SELECT MODE, PINS 13 AND 14 CAN BE USED AS THE
ALTERNATE FUNCTIONS (PWM3, TACH4/THERM
) ONLY IF THE
CORRECT CIRCUIT IS MUXED IN AT THE CORRECT TIME.
CARE SHOULD BE TAKEN TO ENSURE THAT PIN 13
(PWM3/ADDR_EN
) IS EITHER TIED HIGH OR LOW. LEAVING
PIN 13 FLOATING COULD CAUSE THE ADT7463 TO POWERUP
WITH AN UNEXPECTED ADDRESS.
DO NOT LEAVE ADDR_EN
ADDR_SEL
ADT7463
14
13
PWM3/
ADDR_EN
10 kW
V
CC
NC
The ability to make hardwired changes to the SMBus
slave address allows the user to avoid conflicts with other
devices sharing the same serial bus, for example, if more
than one ADT7463 is used in a system.
The serial bus protocol operates as follows:
1. The master initiates data transfer by establishing a
START condition, defined as a hightolow
transition on the serial data line SDA while the
serial clock line SCL remains high. This indicates
that an address/data stream will follow. All slave
peripherals connected to the serial bus respond to
the START condition and shift in the next eight
bits, consisting of a 7bit address (MSB first) plus
a R/W
bit, which determines the direction of the
data transfer, i.e., whether data will be written to
or read from the slave device.
The peripheral whose address corresponds to the
transmitted address responds by pulling the data
line low during the low period before the ninth
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