參數(shù)資料
型號(hào)： ADT7460
廠商： Analog Devices, Inc.
英文描述： dB COOL?? Remote Thermal Controller and Fan Controller
中文描述： 分貝很酷吧？？遠(yuǎn)程熱控制器和風(fēng)扇控制器
文件頁(yè)數(shù)： 9/48頁(yè)
文件大?。?/td> 695K
代理商： ADT7460
REV. 0
ADT7460
–9–
SERIAL BUS INTERFACE
Control of the ADT7460 is carried out using the serial System
Management bus (SMBus). The ADT7460 is connected to this
bus as a slave device, under the control of a master controller.
The ADT7460 has a 7-bit serial bus address. When the device
is powered up with Pin 8 (PWM3/
Address Enable
) high, the
ADT7460 will have a default SMBus address of 0101110 or
0x2E. If more than one ADT7460 is to be used in a system,
then each ADT7460 should be placed in Address Select Mode
by strapping Pin 8 low on power-up. The logic state of Pin 9
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 8 State
Pin 9 State
Low (10 k
to GND)
High (10 k
pull-up)
Don’t Care
Address
0
0
1
0101100 (2Ch)
0101101 (2Dh)
0101110 (2Eh)
(default)
ADT7460
9
8
ADDR_SEL
PWM3/
ADDR_EN
V
CC
10k
ADDRESS = 0x2E
Figure 3. Default SMBus Address = 0x2E
ADT7460
9
8
ADDR_SEL
PWM3/
ADDR_EN
10k
ADDRESS = 0x2C
Figure 4. SMBus Address = 0x2C (Pin 9 = 0)
The facility 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
ADT7460 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.
ADT7460
ADDR_SEL
PWM3/
ADDR_EN
ADDRESS = 0x2D
9
8
V
CC
10k
Figure 5. SMBus Address = 0x2D (Pin 9 = 1)
ADT7460
9
8
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 8
(PWM3/
ADDR_EN
) IS EITHER TIED HIGH OR LOW. LEAVING PIN 8
FLOATING COULD CAUSE THE ADT7460 TO POWER UP WITH AN
UNEXPECTED ADDRESS.
NOTE THAT IF THE ADT7460 IS PLACED INTO ADDRESS SELECT
MODE, PINS 8 AND 9 CAN BE USED AS THE ALTERNATE FUNC-
TIONS (PWM3, TACH4/
THERM
) ONLY IF THE CORRECT CIRCUIT IS
MUXED IN AT THE CORRECT TIME
Figure 6. Unpredictable SMBus Address if Pin 8
is Unconnected
R/
W
0
SCL
SDA
1
0
1
1
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADT7460
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS
BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
1
9
1
ACK. BY
ADT7460
9
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADT7460
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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PDF描述
ADT7460ARQ dB COOL?? Remote Thermal Controller and Fan Controller
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