Rainbow-electronics DS2422 Manual do Utilizador Página 2
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DS2422
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ABSOLUTE MAXIMUM RATINGS*
ALARM, PUMP_ONZ, SDATA, SCLK, CNVST, VPAD,
I/O Voltage to GND
-0.3V, +6V
ALARM, PUMP_ONZ, I/O Combined Sink Current
20mA
Operating Temperature Range -40°C to +85°C
Junction Temperature +150°C
Storage Temperature Range -55°C to +125°C
Soldering Temperature See IPC/JEDEC J-STD-020A
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is
not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device.
ELECTRICAL CHARACTERISTICS
(V
PUP
= 3.0V to 5.25V, V
BAT
= 2.0V to 3.6V, V
PAD
= 3.0V to 5.5V, T
A
= -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
I
BAT1
V
BAT
at 3.0V, I/O at 0V, RTC on 1200 2000
Standby Supply Current
I
BAT0
V
BAT
at 3.6V, I/O at 0V, RTC off 50 650
nA
Ground Current I
GND
Applies individually to GND, AGND
(Note 1)
20 mA
I/O Pin General Data
1-Wire Pullup Resistance
R
PUP
(Notes 1, 2)
2.2
kW
Input Capacitance C
IO
(Notes 3, 4) 100 800 pF
Input Load Current I
L
I/O pin at V
PUP,
V
BAT
= 3.6V 6 10 µA
High-to-Low Switching
Threshold
V
TL
(Notes 4, 5, 6) 0.4 3.2 V
Input Low Voltage V
IL
(Notes 1, 7) 0.3 V
Low-to-High Switching
Threshold
V
TH
(Notes 4, 5, 8) 0.7 3.4 V
Switching Hysteresis V
HY
(Notes 4, 9) 0.09 N/A V
Output Low Voltage V
OL
At 4mA (Note 10) 0.4 V
Standard speed, R
PUP
= 2.2kW
5
Overdrive speed, R
PUP
= 2.2kW
2
Recovery Time (Note 1) t
REC
Overdrive speed, directly prior to reset
pulse; R
PUP
= 2.2kW
5
µs
Rising-Edge Hold-off Time t
REH
(Notes 4, 11) 0.6 2.0 µs
Standard speed 65
Overdrive speed, V
PUP
> 4.5V 8
Timeslot Duration (Note 1) t
SLOT
Overdrive speed (Note 12) 9.5
µs
I/O Pin, 1-Wire Reset, Presence Detect Cycle
Standard speed, V
PUP
> 4.5V 480 720
Standard speed (Note 12) 690 720
Overdrive speed, V
PUP
> 4.5V 48 80
Reset Low Time (Note 1) t
RSTL
Overdrive speed (Note 12) 70 80
µs
Standard speed, V
PUP
> 4.5V 15 60
Standard speed (Note 12) 15 63.5
Presence Detect High
Time
t
PDH
Overdrive speed (Note 12) 2 7
µs
Standard speed, V
PUP
> 4.5V 1.5 5
Standard speed 1.5 8
Presence Detect Fall Time
(Notes 4, 13)
t
FPD
Overdrive speed 0.15 1
µs
Standard speed, V
PUP
> 4.5V 60 240
Standard speed (Note 12) 60 287
Overdrive speed, V
PUP
> 4.5V
(Note 12)
7 24
Presence Detect Low
Time
t
PDL
Overdrive speed (Note 12) 7 28
µs
Standard speed, V
PUP
> 4.5V 65 75
Standard speed 71.5 75
Presence Detect Sample
Time (Note 1)
t
MSP
Overdrive speed 8 9
µs
- 1-Wire Temperature/Datalogger 1
- ELECTRICAL CHARACTERISTICS 2
- 3.5 4 4.5 3
- PIN DESCRIPTION 6
- DESCRIPTION 6
- APPLICATION 6
- OVERVIEW 8
- PARASITE POWER 9
- 64-BIT LASERED ROM 9
- Figure 5. 64-Bit Lasered ROM 10
- Figure 7. DS2422 Memory Map 10
- TIMEKEEPING AND CALENDAR 12
- SAMPLE RATE 13
- TEMPERATURE CONVERSION 13
- SERIAL DATA INPUT 14
- TEMPERATURE SENSOR ALARM 15
- SERIAL INPUT ALARM 15
- REAL-TIME CLOCK CONTROL 16
- MISSION CONTROL 17
- ALARM STATUS 18
- GENERAL STATUS 18
- MISSION START DELAY 19
- MISSION TIME STAMP 19
- MISSION PROGRESS INDICATOR 20
- OTHER INDICATORS 20
- SECURITY BY PASSWORD 20
- Password Control Register 21
- Read Access Password Register 21
- Full Access Password Register 21
- SERIAL DATA INTERFACE TUNING 22
- TEMPERATURE CONVERTER TRIM 22
- DATALOG MEMORY USAGE 22
- MISSIONING 24
- Figure 11. Address Registers 25
- WRITING WITH VERIFICATION 26
- READ SCRATCHPAD COMMAND [AAh] 26
- 28 of 48 28
- 29 of 48 29
- 30 of 48 30
- 31 of 48 31
- 32 of 48 32
- FORCED CONVERSION [55h] 33
- MEMORY ACCESS CONFLICTS 33
- 1-Wire BUS SYSTEM 34
- HARDWARE CONFIGURATION 34
- TRANSACTION SEQUENCE 35
- INITIALIZATION 35
- OVERDRIVE SKIP ROM [3Ch] 37
- OVERDRIVE MATCH ROM [69h] 37
- 38 of 48 38
- 39 of 48 39
- 1-Wire SIGNALING 40
- Read/Write Time Slots 40
- Master-to-Slave 41
- Slave-to-Master 41
- IMPROVED NETWORK BEHAVIOR 42
- CRC GENERATION 42
- READ SCRATCHPAD (CANNOT FAIL) 44
- STOP MISSION WITH PASSWORD 46
- PACKAGE INFORMATION 48
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