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PDF DS1920 Data sheet ( Hoja de datos )

Número de pieza DS1920
Descripción Temperature iButton
Fabricantes Dallas Semiconductor 
Logotipo Dallas Semiconductor Logotipo



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No Preview Available ! DS1920 Hoja de datos, Descripción, Manual

www.dalsemi.com
SPECIAL FEATURES
§ Digital thermometer measures temperatures
from -55°C to +100°C in typically 0.2
seconds
§ Zero standby power
www.DataSh§eet40U..5co°mC resolution, digital temperature reading
is two’s complement of °C value
§ Access to internal counters allows increased
resolution through interpolation
§ Reduces control, address, data, and power to
a single data contact
§ 8-bit device-generated CRC for data integrity
§ 8-bit family code specifies DS1920
communications requirements to reader
§ Special command set allows user to skip
ROM section and do temperature
measurements simultaneously for all devices
on the bus
§ 2 bytes of EEPROM to be used either as
alarm triggers or user memory
§ Alarm search directly indicates which device
senses alarming temperatures
COMMON iButton FEATURES
§ Unique, factory-lasered and tested 64-bit
registration number (8-bit family code + 48-
bit serial number + 8-bit CRC tester) assures
absolute traceability because no two parts are
alike
F3 MICROCANTM
0.36
3.10
0.51
c 1993
16.25
YYWW REGISTERED RR
A0 10
000000FBC52B
17.35
DS1920
Temperature iButton
§ Multidrop controller for MicroLAN
§ Digital identification and information by
momentary contact
§ Chip-based data carrier compactly stores
information
§ Data can be accessed while affixed to object
§ Economically communicates to bus master
with a single digital signal at 16.3k bits per
second
§ Standard 16 mm diameter and 1-WireTM
protocol ensure compatibility with iButton
family
§ Button shape is self-aligning with cup-
shaped probes
§ Durable stainless steel case engraved with
registration number withstands harsh
environments
§ Easily affixed with self-stick adhesive
backing, latched by its flange, or locked with
a ring pressed onto its rim
§ Presence detector acknowledges when reader
first applies voltage
§ Meets UL#913 (4th Edit.); Intrinsically Safe
Apparatus, approved under Entity Concept
for use in Class I, Division 1, Group A, B, C
and D Locations (application pending)
F5 MICROCANTM
5.89
0.36
0.51
c 1993
YYWW REGISTERED RR
20 10
000000FBD8B3
16.25
17.35
DATA
GROUND
All dimensions are shown in millimeters
DATA
GROUND
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081699

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DS1920 pdf
DS1920
The most significant (sign) bit is duplicated into all of the bits in the upper MSB of the 2-byte
temperature register in memory. This “sign-extension” yields the 16-bit temperature readings as shown in
Table 1.
Higher resolutions may be obtained by the following procedure. First, read the temperature, and truncate
the 0.5°C bit (the LSB) from the read value. This value is TEMP_READ. The value left in the counter
may then be read. This value is the count remaining (COUNT_REMAIN) after the gate period has
ceased. The last value needed is the number of counts per degree C (COUNT_PER_C) at that
temperature. The actual temperature may be then be calculated by the user using the following formula:
TEMPERATURE = TEMP_READ - 0.25 + (COUNT_PER_C - COUNT_REMAIN)
COUNT_PER_C
www.DataSheet4U.com
TEMPERATURE MEASURING CIRCUITRY Figure 3
SET/CLEAR
LSB
TEMPERATURE/DATA RELATIONSHIPS Table 1
TEMPERATURE
DIGITAL OUTPUT
(BINARY)
+100°C
00000000 11001000
+25°C
00000000 00110010
°C
00000000 00000001
+0°C
00000000 00000000
°C
11111111 11111111
-25°C
11111111 11001110
-55°C
11111111 10010010
DIGITAL OUTPUT
(HEX)
00C8H
0032H
0001H
0000H
FFFFH
FFCEH
FF92H
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DS1920 arduino
DS1920
Read Scratchpad [BEh]
This command reads the complete scratchpad. After the last byte of the scratchpad is read, the bus master
will receive an 8-bit CRC of all scratchpad bytes. If not all locations are to be read, the master may issue
a reset to terminate reading at any time.
Copy Scratchpad [48h]
This command copies from the scratchpad into the EEPROM of the DS1920, storing the temperature
trigger bytes in nonvolatile memory. The bus master has to enable a strong pullup for at least 10 ms
immediately after issuing this command.
Convert Temperature [44h]
This command begins a temperature conversion. No further data is required. The bus master has to enable
www.DataShaesett4rUo.ncogmpullup for 0.5 seconds immediately after issuing this command.
Recall [B8h]
This command recalls the temperature trigger values stored in EEPROM to the scratchpad. This recall
operation happens automatically upon power-up to the DS1920 as well, so valid data is available in the
scratchpad as soon as the device has power applied.
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