ADM1028ARQ ON Semiconductor, ADM1028ARQ Datasheet - Page 16

• Manufacturer Part Number: ADM1028ARQ
• Description: IC SENSOR TEMP/FAN CTRL 16QSOP
• Manufacturer: ON Semiconductor

Specifications of ADM1028ARQ

• Rohs Status: RoHS non-compliant
• Function: Fan Control, Temp Monitor
• Topology: ADC, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: 0°C ~ 100°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP

ADM1028
Revision History
Location
4/03—Data Sheet changed from REV. A to REV. B.
Added ESD Caution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/02—Data Sheet changed from REV. 0 to REV. A.
Edits to FUNCTIONAL BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Edits to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Added Fan Speed Ramp Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Edits to Table III . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Added Table X . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Bit
0
<2:1>
<7:3>
Ramp Rate
Name
Fan Speed Ramp
Enable
Reserved
Table X. Register 0xCO Fan Speed Ramp Register. Power-On Default <7:0> = 00h
0.010
0.004
COPLANARITY
0.065
0.049
Read/Write
Read/Write
Read/Write
Read/Write
16-Lead Shrink Small Outline Package [QSOP]
0.004
16
1
PIN 1
0.025
BSC
COMPLIANT TO JEDEC STANDARDS MO-137AB
0.193
BSC
OUTLINE DIMENSIONS
Dimensions shown in inches
0.012
0.008
9
8
Description
Setting this bit to a “1” will enable the fan speed ramping mechanism.
When this bit is a 1, writing to the Fan Speed Register will set the new
target fan speed; the input to the DAC will then count, up or down as
appropriate, to the new fan speed value at the rate specified in bits [1:2]
of this register. Clearing this bit to “0” will disable the fan speed ramp-
ing mechanism and will cause data written to the Fan Speed Register to
be immediately reflected to the DAC. The DAC input may or may not
continue ramping if this bit is changed from a “1” to a “0” while the fan
speed is currently ramping.
Fan Speed Ramp Rate. The speed at which the fan speed ramp counter
increments/decrements is selected as follows:
Bits <2:1>
00
01
10
11
Reserved (Default = 0)
(RQ-16)
–16–
SEATING
PLANE
0.154
0.069
0.053
BSC
0.236
BSC
Count Rate
1.0s
0.25s
0.125s
0.0625s
0.010
0.006
8
0
Counter Frequency
1 Hz
4 Hz
8 Hz
16 Hz
0.050
0.016
REV. B
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