ADM1031
Table 4. ELECTRICAL CHARACTERISTICS (T A = T MIN to T MAX , V CC = V MIN to V MAX , unless otherwise noted.) (Note 1)
Parameter
Test Conditions/Comments
Min
Typ
Max
Unit
OPEN-DRAIN SERIAL DATA BUS OUTPUT (SDA)
Output Low Voltage, V OL
High-Level Output Leakage Current, I OH
I OUT = –6.0 mA; V CC = 3.0 V
V OUT = V CC
?
?
?
0.1
0.4
1.0
V
m A
SERIAL BUS DIGITAL INPUTS (SCL, SDA)
Input High Voltage, V IH
Input Low Voltage, V IL
Hysteresis
2.1
?
?
?
?
500
?
0.8
?
V
V
mV
DIGITAL INPUT LOGIC LEVELS (ADD, THERM, TACH1/2) (Note 2)
Input High Voltage, V IH
Input Low Voltage, V IL
2.1
?
?
?
?
0.8
V
V
DIGITAL INPUT LEAKAGE CURRENT
Input High Current, I IH
Input Low Current, I IL
Input Capacitance, C IN
V IN = V CC
V IN = 0
–1.0
?
?
?
?
5.0
?
1.0
?
m A
m A
pF
FAN RPM-TO-DIGITAL CONVERTER
Accuracy
Full-Scale Count
TACH Nominal Input RPM
Conversion Cycle Time
60 ? C ? T A ? 100 ? C
Divisor N = 1, Fan Count = 153
Divisor N = 2, Fan Count = 153
Divisor N = 4, Fan Count = 153
Divisor N = 8, Fan Count = 153
?
?
?
?
?
?
?
?
?
4400
2200
1100
550
637
? 6.0
255
?
?
?
?
?
%
RPM
ms
SERIAL BUS TIMING (Note 3)
Clock Frequency, f SCLK
Glitch Immunity, t SW
Bus Free Time, t BUF
Start Setup Time, t SU;STA
Start Hold Time, t HD ; STA
Stop Condition Setup Time, t SU;STO
SCL Low Time, t LOW
SCL High Time, t HIGH
SCL, SDA Rise Time, t R
SCL, SDA Fall Time, t F
Data Setup Time, t SU;DAT
Data Hold Time, t HD;DAT
See Figure 2 for All Parameters
10
?
4.7
4.7
4.0
4.0
1.3
4.0
?
?
250
300
?
50
?
?
?
?
?
?
?
?
?
?
100
?
?
?
?
?
?
50
1000
300
?
?
kHz
ns
m s
m s
m s
m s
m s
m s
ns
ns
ns
ns
1. Typicals are at T A = 25 ? C and represent most likely parametric norm. Shutdown current typ is measured with V CC = 3.3 V.
2. ADD is a three-state input that can be pulled high, low, or left open-circuit.
3. Timing specifications are tested at logic levels of V IL = 0.8 V for a falling edge and V IH = 2.2 V for a rising edge.
t LOW
t R
t F
t HD; STA
SCL
t HD; STA
t HD; DAT
t HIGH
t SU; DAT
t SU; STA
t SU; STO
SDA
P
t BUF
S
S
P
Figure 2. Serial Bus Timing Diagram
http://onsemi.com
4
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