DS1780 Datasheet, PDF (24/28 Pages) Dallas Semiconductor – CPU Peripheral Monitor

DC ELECTRICAL CHARACTERISTICS:
Fan RPM-to-Digital Converter
PARAMETER
Accuracy
Full scale count
SYMBOL
CONDITION
0°C≤TA
≤100°C
-40°C≤TA
≤+125°C
Divisor=1; Fan
Count=153
FAN1 & FAN2
Normal Input RPM
Divisor=2; Fan
Count=153
Divisor=4; Fan
Count=153
Divisor=8; Fan
Count=153
Internal Oscillator
Frequency
+25°C≤TA
≤+75°C
DS1780
(-40°C to +125°C, 2.8V ≤ V_DD ≤ 5.75V)
MIN TYP MAX UNITS NOTES
±6
%
±12
255 decimal
8800
4400
2200
RPM
8
1100
21.15 22.5 23.85
kHz
DC ELECTRICAL CHARACTERISTICS:
Analog Output V_OUT
PARAMETER SYMBOL
DAC Resolution
Voltage Range
CONDITION
Error
DAC_ERR
Output Current
Load Capacitance
I_OUT
C_LOAD
(-40°C to +125°C, 2.8V ≤ V_DD ≤ 5.75V)
MIN TYP MAX UNITS NOTES
8
bits
0
1.25
V
±5
% of
FSR
2.0
mA
100
pF
DC ELECTRICAL CHARACTERISTICS:
Digital Outputs: A0NT_OUT
PARAMETER SYMBOL
Logical “1”
Output Voltage
V_OUT(1)
Logical “0”
Output Voltage
V_OUT(0)
CONDITION
I_OUT=±5 mA at
V_DD=4.25V
I_OUT=±3 mA at
V_DD=2.85V
I_OUT=±5 mA at
V_DD=5.75V
I_OUT=±3 mA at
V_DD=3.45V
(-40°C to +125°C, 2.8V ≤ V_DD ≤ 5.75V)
MIN TYP MAX UNITS NOTES
2.4
V
0.4
V
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