Rainbow Electronics DS2422 User Manual
Page 3
DS2422
3 of 48
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I/O Pin, 1-Wire Write
Standard speed
60
120
Overdrive speed, V
PUP
> 4.5V
(Note 12)
6
12
Write-0 Low Time (Note 1)
t
W0L
Overdrive speed (Note 12)
7.5
12
µs
Standard speed
5
15 -
e
Write-1 Low Time
(Notes 1, 14)
t
W1L
Overdrive speed
1
1.95 -
e
µs
I/O Pin, 1-Wire Read
Standard speed
5
15 -
d
Read Low Time
(Notes 1, 15)
t
RL
Overdrive speed
1
1.95 -
d
µs
Standard speed
t
RL
+
d
15
Read Sample Time
(Notes 1, 15)
t
MSR
Overdrive speed
t
RL
+
d
1.95
µs
ALARM Output Pin
Output Low Voltage
V
OL
Sink current 4mA
0.6
V
Pin Leakage Current
I
LP
ALARM pin at 6V
6
µA
CNVST, SCLK Output Pins
V
PAD
= 5V, I
L
= 3mA
0.3
Output Low Voltage
V
OL
V
PAD
= 3V, I
L
= 3mA
0.3
V
V
PAD
= 5V, I
L
= 3mA
4
Output High Voltage
V
OH
V
PAD
= 3V, I
L
= 3mA
2
V
PUMP_ONZ Output Pin
V
BAT
= 3.6V, I
L
= 2mA
0.4
Output Low Voltage
V
OL
V
BAT
= 2.0V, I
L
= 2mA
0.4
V
Output High Voltage
V
BAT
= 3.6V, I
L
= 0.5mA
2.5
V
OH
V
BAT
= 2.0V, I
L
= 0.5mA
1.4
V
SDATA Input Pin
V
BAT
= 3.6V
2.5
Input High Voltage
V
IH
V
BAT
= 2.0V
1.4
V
V
BAT
= 3.6V
0.4
Input Low Voltage
V
IL
V
BAT
= 2.0V
0.4
V
Pin Leakage Current
I
LP
SDATA pin at 5.5V
10
µA
Serial Interface Timing
CLK Period
t
RING
0.5
1
9
µs
PUMP_ONZ Fall to
CNVST Rise
t
SP
Power-on default (Notes 4, 19)
3.5
4
4.5
ms
CNVST Pulse Width
t
CPW
(Note 4)
70
140
1260
µs
CNVST Fall to SCLK High
(First Clock)
t
SCH
(Note 4)
8
16
144
µs
SCLK Period
t
SCP
50% duty cycle (Note 4)
1
2
18
µs
SDATA Setup Time
t
SDS
(Note 4)
75
ns
SDATA Hold Time
t
SDH
(Note 4)
3
ns
Real-Time Clock
Accuracy
+25°C (Note 16)
-2
+2
min./
month
Frequency Deviation
D
F
-40°C to +85°C (Note 16)
-300
+60
PPM
Temperature Converter
Operating Range
T
TC
3V at V
BAT
-40
+85
°C
8-bit mode
30
50
75
Conversion Time (Note 4)
t
CONV
16-bit mode (11 bits)
240
400
600
ms
Thermal Response Time
Constant (Notes 4, 17)
t
RESP
SO package
95
s
+10°C to +60°C
Conversion Error
(Notes 4, 18)
DJ
-40°C to +85°C
See Temperature Accuracy
Graphs
°C
Conversion Current
I
CONV
(Note 4)
180
350
550
µA