參數(shù)資料
型號： AMD1027
廠商： Analog Devices, Inc.
英文描述： dBCOOL Remote Thermal Controller and Voltage Monitor
中文描述： dBCOOL遠程熱控制器和電壓監(jiān)視器
文件頁數(shù)： 11/56頁
文件大?。?/td> 1072K
代理商： AMD1027
REV. A
ADM1027
–11–
5. Once the ADM1027 has responded to the alert response
address, the master must read the status registers and the
SMBALERT
will only be cleared if the error condition has
gone away.
SMBus Timeout
The ADM1027 includes an SMBus timeout feature. If there is
no SMBus activity for a minimum of 15 ms and a maximum of
35 ms, the ADM1027 assumes that the bus is locked and releases
the bus. This prevents the device from locking or holding the
SMBus expecting data. Some SMBus controllers cannot handle
the SMBus timeout feature, so it can be disabled.
CONFIGURATION REGISTER 1 – Register 0x40
<6>
TODIS = 0;
SMBus timeout enabled (default)
<6>
TODIS = 1;
SMBus timeout disabled
VOLTAGE MEASUREMENT INPUTS
The ADM1027 has four external voltage measurement channels.
It can also measure its own supply voltage, V
CC
.
Pins 20 to 23 are dedicated to measuring 5 V, 12 V, 2.5 V supplies
and the processor core voltage V
CCP
(0 V to 3 V input). The
V
CC
supply voltage measurement is carried out through the V
CC
pin (Pin 4). Setting Bit 7 of Configuration Register 1 (Reg. 0x40)
allows a 5 V supply to power the ADM1027 and be measured
without overranging the V
CC
measurement channel. The 2.5 V
input can be used to monitor a chipset supply voltage in com-
puter systems.
ANALOG-TO-DIGITAL CONVERTER
All analog inputs are multiplexed into the on-chip, successive
approximation, analog-to-digital converter. This has a resolu-
tion of 10 bits. The basic input range is 0 V to 2.25 V, but the
inputs have built-in attenuators to allow measurement of 2.5 V,
3.3 V, 5 V, 12 V and the processor core voltage V
CCP
, without
any external components. To allow for the tolerance of these
supply voltages, the ADC produces an output of 3/4 full scale
(768 decimal or 300 hex) for the nominal input voltage, and so
has adequate headroom to cope with overvoltages.
INPUT CIRCUITRY
The internal structure for the analog inputs is shown in Figure 12.
Each input circuit consists of an input protection diode, an
attenuator, and a capacitor to form a first order low-pass filter
that gives the input immunity to high frequency noise.
VOLTAGE MEASUREMENT REGISTERS
Reg. 0x20
2.5 V Reading
= 0x00 default
Reg. 0x21
V
CCP
Reading
= 0x00 default
Reg. 0x22
V
CC
Reading
= 0x00 default
Reg. 0x23
5 V Reading
= 0x00 default
Reg. 0x24
12 V Reading
= 0x00 default
VOLTAGE MEASUREMENT LIMIT REGISTERS
Associated with each voltage measurement channel are high and
low limit registers. Exceeding the programmed high or low limit
causes the appropriate status bit to be set. Exceeding either limit
can also generate
SMBALERT
interrupts.
Reg. 0x44
2.5 V Low Limit
= 0x00 default
Reg. 0x45
2.5 V High Limit
= 0xFF default
Reg. 0x46
V
CCP
Low Limit
= 0x00 default
Reg. 0x47
V
CCP
High Limit
= 0xFF default
Reg. 0x48
V
CC
Low Limit
= 0x00 default
Reg. 0x49
V
CC
High Limit
= 0xFF default
Reg. 0x4A
5 V Low Limit
= 0x00 default
Reg. 0x4B
5 V High Limit
= 0xFF default
Reg. 0x4C
12 V Low Limit
= 0x00 default
Reg. 0x4D
12 V High Limit
= 0xFF default
30pF
120k
30pF
93k
MUX
30pF
68k
30pF
45k
105k
35pF
35k
94k
71k
47k
20k
12V
IN
5V
IN
3.3V
IN
2.5V
IN
V
CCPIN
Figure 12. Structure of Analog Inputs
Table II shows the input ranges of the analog inputs and output
codes of the 10-bit A/D converter.
When the ADC is running, it samples and converts a voltage
input in 711
m
s, and averages 16 conversions to reduce noise.
Therefore a measurement on any input takes nominally 11.38 ms.
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