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參數資料
| 型號： | ADM1033ARQ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Thermal Monitor and Fan Speed (RPM) Controller |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | MO-137AB, QSOP-16 |
| 文件頁數： | 28/40頁 |
| 文件大小： | 1164K |
| 代理商： | ADM1033ARQ-REEL |
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ADM1033
LOOK-UP TABLE: MODES OF OPERATION
The ADM1033 look-up table has two modes of operation used
to determine the behavior of the system:
Rev. 0 | Page 28 of 40
Manual mode
Manual Mode
In manual mode, the ADM1033 is under software control. The
software programs the required fan speed value or target rpm
value. The ADM1033 then outputs that fan speed.
Look-up table
Programming Target Fan Speed
In this mode, the user programs the target rpm as a TACH
count for N poles or a TACH count for one full rotation of the
fan. This assumes that the number of poles is programmed
correctly in Configuration 3 Register (Address 0x03).
Follow these steps to program the target fan speed:
1.
Place the ADM1033 in manual mode. Set Bit 7 (Table/SW)
of Configuration Register 1 (Address 0x01) = 0.
2.
Program the target TACH count (fan speed) using the
following equation:
TACH Count
= (
f
× 60)/
R
where:
f
= clock frequency = 81.92 kHz
R
= required rpm value
Example
1
: If the desired value is 5,000 rpm, program the
following value to the TACH pulse period registers:
TACH Pulse Period
= (
f
× 60)/5000
TACH Pulse Period
= 983d = 0x03D7
Example
2
: If the desired value is 3,500 rpm, program the
following value to the TACH pulse period registers:
TACH Pulse Period
= (
f
× 60)/3500
TACH Pulse Period
= 1404d = 0x057C
Table 28. Registers to be Programmed
Fan
Description
Example 1
Look-Up Table LSB
Example 1
Look-Up Table MSB
Example 2
Look-Up Table LSB
Example 2
Look-Up Table MSB
Address
0x2A
0x2B
0x2C
0x2D
Value
0xD7
0x03
0x7C
0x05
LOOK-UP TABLE
The ADM1033 allows the user to program a temperature-to-
fan-speed profile. There are 24 registers in the look-up table,
eight for temperature and 16 for target fan speed (each target
fan speed is two registers). In total, there are eight available
points.
There are two options when programming the look-up table. It
can be programmed to make the fan run at discrete speeds and
jump to the new speed once the temperature threshold is
crossed. Or, it can linearly ramp the TACH count between the
two temperature thresholds.
Figure 40 and Figure 41 show what the look-up table looks like,
if all eight points are used on the one curve for both fans.
Figure 40 shows the transfer curve when the fan is programmed
to run at discrete speeds. The ADM1033 spins the fan at its new
speed once a threshold is crossed.
TACH COUNT 8
TACH COUNT 7
FAN SPEED
T1
T2
T3
T4
T5
T6
T7
T8
TEMPERATURE
TACH COUNT 6
TACH COUNT 5
TACH COUNT 4
TACH COUNT 3
TACH COUNT 2
TACH COUNT 1
0
Figure 40. Programming the Look-Up Table in Discrete RPM Mode
Figure 41 shows the transfer curve if the linear fan speeds
option is chosen. At temperature T1, the fan runs at Fan Speed 1.
As the temperature increases, the fan speed increases until it
reaches Fan Speed 2 at T2.
TACH COUNT 8
TACH COUNT 7
FAN SPEED
T1
T2
T3
T4
T5
T6
T7
T8
TEMPERATURE
TACH COUNT 6
TACH COUNT 5
TACH COUNT 4
TACH COUNT 3
TACH COUNT 2
TACH COUNT 1
0
Figure 41. Programming the Look-Up Table in Linear Fan Speeds Mode
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