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PDF DS1921Z Data sheet ( Hoja de datos )

Número de pieza DS1921Z
Descripción High-Resolution Thermochron iButton
Fabricantes Dallas Semiconducotr 
Logotipo Dallas Semiconducotr Logotipo



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No Preview Available ! DS1921Z Hoja de datos, Descripción, Manual

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DS1921H/Z
High-Resolution Thermochron iButton
Range H: +15°C to +46°C; Z: -5°C to +26°C
SPECIAL FEATURES
Digital thermometer measures temperature in
1/8°C increments with ±1°C accuracy
Built-in real-time clock (RTC) and timer has
accuracy of ±2 minutes per month from 0°C
to 45°C
Automatically wakes up and measures
temperature at user-programmable intervals
from 1 to 255 minutes
Logs up to 2048 consecutive temperature
measurements in protected nonvolatile (NV)
random access memory
Records a long-term temperature histogram
with 1/2°C resolution
Programmable temperature-high and
temperature-low alarm trip points
Records up to 24 time stamps and durations
when temperature leaves the range specified
by the trip points
512 bytes of general-purpose read/write NV
random access memory
Communicates to host with a single digital
signal at 15.4kbits or 125kbits per second
using 1-Wire® protocol
Fixed range: H: +15°C to +46°C;
Z: -5°C to +26°C
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 MICROCAN
5.89
0.51
16.25
D6 21
3B2000FBC52B
1-Wire
Thermochron®
17.35
IO GND
COMMON iButton FEATURES
All dimensions are shown in millimeters.
Digital identification and information by
momentary contact
ORDERING INFORMATION
Unique, factory-lasered and tested 64-bit reg-
istration number (8-bit family code + 48-bit
serial number + 8-bit CRC tester) assures ab-
DS1921H-F5 +15°C to +46°C F5 iButton®
DS1921Z-F5 -5°C to +26°C F5 iButton
solute traceability because no two parts are
alike
Multidrop controller for 1-Wire net
Chip-based data carrier compactly stores
information
Data can be accessed while affixed to object
Button shape is self-aligning with cup-shaped
EXAMPLES OF ACCESSORIES
DS9096P
Self-Stick Adhesive Pad
DS9101
Multi-Purpose Clip
DS9093RA Mounting Lock Ring
DS9093A
Snap-In Fob
DS9092
iButton Probe
probes
1-Wire, Microcan, and iButton are registered trademarks of Dallas Semiconductor.
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DS1921Z pdf
1-Wire CRC GENERATOR Figure 4
Polynomial = X8 + X5 + X4 + 1
DS1921H/Z
1st 2nd 3rd 4th
STAGE STAGE STAGE STAGE
X0 X1 X2 X3
5th
STAGE
X4
6th 7th 8th
STAGE STAGE STAGE
X5 X6
X7
INPUT DATA
X8
MEMORY
The memory map of the DS1921H/Z is shown in Figure 5. The 4096-bit general-purpose SRAM make up
pages 0 through 15. The timekeeping, control, and counter registers fill page 16, called Register Page (see
Figure 6). Pages 17 to 19 are assigned to storing the alarm time stamps and durations. The temperature
histogram bins begin at page 64 and use up to four pages. The temperature logging memory covers pages
128 to 191. Memory pages 20 to 63, 68 to 127, and 192 to 255 are reserved for future extensions. The
scratchpad is an additional page that acts as a buffer when writing to the SRAM memory or the register
page. The memory pages 17 and higher are read-only for the user. They are written to or erased solely
under supervision of the on-chip control logic.
DS1921H/Z MEMORY MAP Figure 5
ADDRESS
0000h to
01FFh
0200h to
021Fh
0220h to
027Fh
0280h to
07FFh
0800h to
087Fh
0880h to
0FFFh
1000h to
17FFh
1800h to
1FFFh
32-Byte Intermediate Storage Scratchpad
General-Purpose SRAM (16 Pages)
32-Byte Register Page
Alarm Time Stamps and Durations
(Reserved for Future Extensions)
Temperature Histogram Memory
(Reserved for Future Extensions)
Datalog Memory (64 Pages)
(Reserved for Future Extensions)
Pages 0 to 15
Page 16
Pages 17 to 19
Pages 20 to 63
Pages 64 to 67
Pages 68 to 127
Pages 128 to 191
Pages 192 to 255
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DS1921Z arduino
BIT DESCRIPTION
MIP: Mission in Progress
SIP: Sample in Progress
TLF: Temperature Low
Flag
THF: Temperature High
Flag
TAF: Timer Alarm Flag
BIT(S)
b5
b4
b2
b1
b0
DS1921H/Z
DEFINITION
If this bit reads 1 the DS1921H/Z has been set up for a mission and this
mission is still in progress. A mission is started if the EM bit of the
Control Register (address 20Eh) is 0 and a non-zero value is written to
the Sample Rate Register, address 20Dh. The MIP bit returns from logic
1 to logic 0 when a mission is ended. A mission will end with the first
write attempt (Copy Scratchpad command) to any register in the
address range of 200h to 213h. Alternatively, a mission can be ended by
directly writing to the Status Register and setting the MIP bit to 0. The
MIP bit cannot be set to 1 by writing to the status register.
If this bit reads 1 the DS1921H/Z is currently performing a temperature
conversion as part of a mission in progress. The mission samples occur
on the seconds rollover from 59 to 00. The SIP bit will change from 0 to
1 approximately 250ms before the actual temperature conversion begins
allowing the circuitry of the chip to wake-up. A temperature conversion
including a wake-up phase takes maximum 875ms. During this time
read accesses to the memory pages 17 and higher are permissible but
may reveal invalid data.
Logic 1 in the Temperature Low Flag bit indicates that a temperature
measurement during a mission revealed a temperature equal to or lower
than the value in the Temperature Low Threshold Register. The
Temperature Low Flag can be cleared at any time by writing this bit to 0.
This flag must be cleared before starting a new mission.
Logic 1 in the Temperature High Flag bit indicates that a temperature
measurement during a mission revealed a temperature equal to or
higher than the value in the Temperature High Threshold Register.
The Temperature High Flag can be cleared at any time by writing this bit
to 0. This flag must be cleared before starting a new mission.
If this bit reads 1, a RTC alarm has occurred (see section
TIMEKEEPING for details). The Timer Alarm Flag can be cleared at any
time by writing this bit to logic 0. Since the timer alarm cannot be
disabled, the TAF flag usually reads 1 during a mission. This flag should
be cleared before starting a new mission.
MISSION TIME STAMP
The Mission Time Stamp indicates the time and date of the first temperature conversion of a mission.
Subsequent temperature conversions will take place as many minutes apart from each other as specified
by the value in the Sample Rate Register. Mission samples occur on minute boundaries.
Mission Time Stamp Register Bitmap
ADDR
0215h
0216h
0217h
0218h
0219h
b7
0
0
0
0
b6 b5 b4
10 Minutes
12/24 20h. 10h.
AM/PM
0 10 Date
0 0 10m.
10 Years
b3
b2 b1
Single Minutes
Single Hours
Single Date
Single Months
Single Years
b0
MISSION SAMPLES COUNTER
The Mission Samples Counter indicates how many temperature measurements have taken place during
the current mission in progress (if MIP = 1) or during the latest mission (if MIP = 0). The value is stored
as an unsigned 24-bit integer number. This counter is reset through the Clear Memory command.
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