ADM1026
ELECTRICAL CHARACTERISTICS
T
A
= T
MIN
to T
MAX
, V
CC
= V
MIN
to V
MAX
, unless otherwise noted. (Note 1, 2, and 3)
Parameter
FAN RPM−TO−DIGITAL CONVERTER
(Note 6)
Accuracy
Full−Scale Count
FAN0 to FAN7 Nominal Input RPM (Note 5)
Divisor = 1, fan count = 153
Divisor = 2, fan count = 153
Divisor = 4, fan count = 153
Divisor = 8, fan count = 153
20
8800
4400
2200
1100
22.5
25
±12
255
RPM
%
Test Conditions/Comments
Min
Typ
Max
Unit
Internal Clock Frequency
OPEN DRAIN O/Ps, PWM, GPIO0 to 16
Output High Voltage, V
OH
High Level Output Leakage Current, I
OH
Output Low Voltage, V
OL
PWM Output Frequency
DIGITAL OUTPUTS (INT, RESETMAIN, RESETSTBY)
Output Low Voltage, V
OL
RESET Pulse Width
OPEN DRAIN SERIAL DATABUS OUTPUT (SDA)
Output Low Voltage, V
OL
High Level Output Leakage Current, I
OH
SERIAL BUS DIGITAL INPUTS (SCL, SDA)
Input High Voltage, V
IH
Input Low Voltage, V
IL
Hysteresis
DIGITAL INPUT LOGIC LEVELS (ADD, CI, FAN 0 to 7, GPIO 0 to 16)
(Note 7 and 8)
Input High Voltage, V
IH
Input Low Voltage, V
IL
Hysteresis (Fan 0 to 7)
RESETMAIN, RESETSTBY
RESETMAIN Threshold
RESETSTBY Threshold
RESETMAIN Hysteresis
RESETSTBY Hysteresis
DIGITAL INPUT CURRENT
Input High Current, I
IH
Input Low Current, I
IL
Input Capacitance, C
IN
EEPROM RELIABILITY
Endurance (Note 9)
Data Retention (Note 10)
SERIAL BUS TIMING
Clock Frequency, f
SCLK
Glitch Immunity, t
SW
Bus Free Time, t
BUF
Start Setup Time, t
SU; STA
See Figure 2 for all parameters.
V
IN
= V
CC
V
IN
= 0
Falling voltage
Falling voltage
V
CC
= 3.3 V
V
CC
= 3.3 V
V
CC
= 3.3 V
I
OUT
= –3.0 mA, V
CC
= 3.3 V
V
OUT
= V
CC
I
OUT
=
−3.0
mA, V
CC
= 3.3 V
I
OUT
= 3.0 mA, V
CC
= 3.3 V
V
OUT
= V
CC
I
OUT
=
−3.0
mA, V
CC
= 3.3 V
kHz
2.4
0.1
75
1.0
0.4
V
mA
V
Hz
0.4
140
180
240
V
ms
0.4
0.1
1.0
V
mA
V
2.2
0.8
500
V
mV
2.4
0.8
250
V
V
mV
2.89
3.01
2.94
3.05
60
70
2.97
3.10
V
V
mV
mV
–1.0
1.0
20
mA
mA
pF
100
10
700
kcycles
Years
400
50
4.7
4.7
kHz
ns
ms
ms
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