Instruction Manual

DS1780
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DC ELECTRICAL CHARACTERISTICS:
Fan RPM-to-Digital Converter (-40°C to +125°C, 2.8V ≤ V
DD
≤ 5.75V)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES
0°C≤TA
≤100°C
±6
Accuracy
-40°C≤TA
≤+125°C
±12
%
Full scale count 255 decimal
Divisor=1; Fan
Count=153
8800
Divisor=2; Fan
Count=153
4400
Divisor=4; Fan
Count=153
2200
FAN1 & FAN2
Normal Input RPM
Divisor=8; Fan
Count=153
1100
RPM 8
Internal Oscillator
Frequency
+25°C≤TA
≤+75°C
21.15 22.5 23.85 kHz
DC ELECTRICAL CHARACTERISTICS:
Analog Output V
OUT
(-40°C to +125°C, 2.8V ≤ V
DD
≤ 5.75V)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES
DAC Resolution 8 bits
Voltage Range 0 1.25 V
Error DAC
ERR
±5
% of
FSR
Output Current I
OUT
2.0 mA
Load Capacitance C
LOAD
100 pF
DC ELECTRICAL CHARACTERISTICS:
Digital Outputs: A0NT
OUT
(-40°C to +125°C, 2.8V ≤ V
DD
≤ 5.75V)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES
I
OUT
=±5 mA at
V
DD
=4.25V
Logical “1”
Output Voltage
V
OUT
(1)
I
OUT
=±3 mA at
V
DD
=2.85V
2.4 V
I
OUT
=±5 mA at
V
DD
=5.75V
Logical “0”
Output Voltage
V
OUT
(0)
I
OUT
=±3 mA at
V
DD
=3.45V
0.4 V