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參數資料
| 型號： | ADT7463 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | dB COOL Remote Thermal Controller and Voltage Monitor |
| 中文描述： | 分貝超酷的遠程熱控制器和電壓監視器 |
| 文件頁數： | 9/53頁 |
| 文件大小： | 719K |
| 代理商： | ADT7463 |
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REV. 0
ADT7463
–9–
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 7-bit serial bus address. When the device
is powered up with Pin 13 (PWM3/
Address Enable
) high, the
ADT7463 will have a default SMBus address of 0101110 or
0x5C. If more than one ADT7463 is to be used in a system,
then each ADT7463 should be placed in Address Select Mode
by strapping Pin 13 low on power-up. The logic state of Pin 14
then determines the device’s SMBus address.
The device address is sampled and latched on the first valid
SMBus transaction, so any attempted addressing changes made
thereafter will have no immediate effect.
Table I. Address Select Mode
Pin 13 State
Pin 14 State
Low (10 k
to GND)
High (10 k
pull-up)
Don’t Care
Address
0
0
1
0101100 (0x2C)
0101101 (0x2D)
0101110 (0x2E)
(default)
ADT7463
14
13
ADDR_SEL
PWM3/
ADDR_EN
V
CC
10k
ADDRESS = 0x2E
Figure 3. Default SMBus Address = 0x2E
ADT7463
14
13
ADDR_SEL
PWM3/
ADDR_EN
10k
ADDRESS = 0x2C
Figure 4. SMBus Address = 0x2C (Pin 14 = 0)
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 high to low 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 7-bit address (MSB first) plus a R/
W
bit, which deter-
mines the direction of the data transfer, i.e., whether data
will be written to or read from the slave device.
ADT7463
ADDR_SEL
PWM3/
ADDR_EN
ADDRESS = 0x2D
14
13
V
CC
10k
Figure 5. SMBus Address = 0x2D (Pin 14 = 1)
ADT7463
14
13
ADDR_SEL
PWM3/
ADDR_EN
V
CC
10k
DO NOT LEAVE ADDR_EN
UNCONNECTED! CAN
CAUSE UNPREDICTABLE
ADDRESSES
NC
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 POWER UP WITH AN
UNEXPECTED ADDRESS.
NOTE THAT IF THE ADT7463 IS PLACED INTO ADDRESS SELECT
MODE, PINS 13 AND 14 CANNOT BE USED AS THE ALTERNATE
FUNCTIONS (PWM3, TACH4/
THERM
) ONLY IF THE CORRECT
CIRCUIT IS MUXED IN AT THE CORRECT TIME
Figure 6. Unpredictable SMBus Address if Pin 13
is Unconnected
R/
W
0
SCL
SDA
1
0
1
1
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADT7463
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS
BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
1
9
1
ACK. BY
ADT7463
9
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADT7463
STOP BY
MASTER
FRAME 3
DATA
BYTE
1
9
SCL (CONTINUED)
SDA (CONTINUED)
Figure 7. Writing a Register Address to the Address Pointer Register, Then Writing Data to the Selected Register
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