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PDF DS1616 Data sheet ( Hoja de datos )

Número de pieza DS1616
Descripción Temperature and Three Input MUXed 8-bit Data Recorder
Fabricantes Dallas Semiconducotr 
Logotipo Dallas Semiconducotr Logotipo



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No Preview Available ! DS1616 Hoja de datos, Descripción, Manual

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PRELIMINARY
DS1616
Temperature and Three Input
MUX’ed 8-bit Data Recorder
FEATURES
Measures four channels of data:
Integrated 8-bit temperature sensor,
Integrated 8-bit Analog-to-Digital Converter
(ADC) with a three input mux for measuring
up to three external sensors
Digital thermometer measures temperature
-40°C to +85°C in 0.5°C increments (-40°F to
+183.2°F in 0.9°F increments)
Digital thermometer provides ±2°C accuracy
Real Time Clock/Calendar in BCD format counts
seconds, minutes, hours, date, month, day of the
week, and year with leap year compensation. The
Real Time Clock is fully Y2K-compliant
Automatically wakes up and measures
temperature and/or ADC data at user-
programmable intervals from 1 to 255 minutes
2048-byte datalog memory
Records long-term temperature histogram in
63 bins with 2.0°C resolution
Records long-term ADC data histogram in 64 bins
with 4-bit resolution/bin (32 mV/bin) for ADC
Channel One
Programmable temperature-high and -low alarm
trip points
Programmable ADC data-high and -low alarm trip
points
Records time stamp and duration when
temperature or ADC Channel 1 Data leaves the
interval specified by the trip points
Two serial interface options: synchronous and
asynchronous
- 3-wire synchronous serial interface
- Asynchronous serial interface compatible with
standard UARTs
Memory partitioned into 32 byte pages for
packetizing data
On-chip 16-bit CRC generator to safeguard data
read operations in asynchronous communications
mode
Unique, factory lasered 64-bit serial number
PIN ASSIGNMENT
VBAT
X1
X2
GND
NC
COMSEL
INSPEC
OUTSPEC
NC
ST
INT
GND
1
2
3
4
5
6
7
8
9
10
11
12
24 VCC
23 RX
22 TX
21 SCLK
20 I/O
19 RST
18 GND
17 AGND
16 AIN3
15 AIN2
14 AIN1
13 N/C
DS1616 24-Pin DIP (600 mil)
DS1616S 24-Pin SOIC (300 mil)
PIN DESCRIPTION
Vbat - Battery Supply
X1 - Crystal Input
X2 - Crystal Output
AINx
- Analog in
INSPEC
- In-specification Output
OUTSPEC - Out-of-specification Output
INT
GND
AGND
- Interrupt Output
- Digital Ground
- Analog Ground
ST - Start/Status Input
RST
I/O
SCLK
TX
RX
COMSEL
VCC
- 3-wire Reset Input
- 3-wire Input/Output
- 3-wire Clock Input
- Transmit Output
- Receive Input
- Communication Select
- +5V Supply
ORDERING INFORMATION
DS1616
24-Pin DIP
DS1616S 24-Pin SOIC
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DS1616 pdf
DS1616
MEMORY
The memory map in Figure 2a shows the general organization of the DS1616. As can be seen in the
figure, the device is segmented into 32-byte pages. Pages 0 and 1 contain the Real Time Clock and
Control registers (see Figure 2b for more detail). The User NV RAM resides in page 2. Pages 17 to 19
are assigned to storing the alarm time stamps and durations and pages 64 to 71 are reserved for histogram
memory. The data logging memory covers pages 128 to 191. Memory pages 3 to 16, 20 to 63, 68 to 127,
and 192 and up are reserved for future extensions.
The end user can write only to the Real Time Clock and Control registers and the User NV RAM. The
rest of the memory map is read-only from the end user’s perspective.
DS1616 MEMORY MAP Figure 2a
0000H
to 003FH
0040H
to 0005FH
RTC and Control Registers
User NV RAM
0060H
to 0217H
(Reserved for Future Extensions)
0218H
to 021FH
00220H
to 027FH
0280H
to 07FFH
0800H
to 087FH
0880H
to 08FFH
0900H
to 0FFFH
1000H
to 17FFH
1800H
and higher
Serial Number
Alarm Time Stamps and Durations
(Reserved for Future Extensions)
Temperature Histogram (63 Bins of 2 Bytes Each)
ADC Channel 1 Data Histogram (64 Bins of 2 Bytes Each)
(Reserved for Future Extensions)
Datalog Memory (64 pages)
(Reserved for Future Extensions)
pages 0 and 1
page 2
page 3
to page 16
(excluding last
8 bytes of
page 16)
page 16
(last 8 bytes)
page 17
to page 19
page 20 - 63
page 64
to page 67
page 68
to page 71
page 72 - 127
page 128
to page 191
page 192 and
higher
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DS1616 arduino
DS1616
Under this mode of operation, the DS1616 will begin a datalog mission when a non-0 value has been
written to the Sample Rate register and the ST pin has been held low for at least 0.5 seconds.
The sample rate during a datalog mission is equal to the value written to the Sample Rate register
multiplied by one minute. Writing a 0 to the MIP bit in the Status 1 register completes the mission.
Upon initiation of datalog mission by either method, the DS1616 will do two things:
1. The INSPEC and OUTSPEC pins will generate four low pulses simultaneously.
2. The Mission-in-Progress (MIP) bit in the Status 1 register is set to a 1.
The time at which the first datalog sample is measured is dependent upon the value in the Start Delay
registers. The two-byte Start Delay register provide a method for the end user to program a delay before
sampling commences. The delay is roughly equal to the value in the Start Delay register times one
minute. For example, if the Start Delay register contain a value of 10, then the device will begin
recording data approximately ten minutes after it received either the pushbutton start signal or start
instruction. The Start Delay register are located at addresses 0012h and 0013h, with register 0012h being
the LSB and register 0013h being the MSB. The Start Delay register decrements every time the Seconds
register rolls over from 59 to 00. When this Start Delay register contains a 00, the first datalog sample
will be taken when the seconds register rolls over from 59 to 00.
The user has two options for dealing with the potential occurrence of a data overrun (i.e., more than 2048
total data samples). The first option is to enable the rollover feature of the DS1616. This is accomplished
by setting the Rollover bit (bit 3 of the Control 1 register) to 1. When the Rollover feature is enabled,
new data is written over previous data, starting with address 1000h. For example, if the Datalog memory
has been completely filled (i.e., 2048 data samples have been recorded) the next data sample will be
written to address location 1000h and the address pointer will be incremented with each successive data
sample.
The second option for dealing with data overrun is to simply stop recording data after the datalog memory
has been completely used. In other words, the DS1616 will stop recording data values after 2048 data
samples. This feature is enabled by disabling the Rollover feature. (Bit 3 of the Control 1 Register) set to
0.
It should be noted that during a datalog mission, a time stamp for the first sample is recorded, but is not
included for each subsequent sample. However, the time of acquisition for any data sample is easily
determined by considering the start time, the sample rate, the value in the Current Sample Counter, and
the address of the particular data sample in the datalog memory. If no rollover has occurred in the
datalog memory, the sample time associated with any particular data point can be calculated by
multiplying the address of the data by the sample rate and adding that to the stored start time value. If the
rollover feature has been enabled, the user can determine if rollover has occurred by reading the value in
the Current Samples register. This register counts the total number of samples that have been acquired.
If this value is greater than 07FFh (decimal 2047) then the user knows that rollover has occurred. If
rollover has occurred, the user needs to determine how many times rollover occurred in determining the
sample time for any particular data sample.
As a safety measure, the DS1616 has been designed such that the end user cannot write to the Datalog
Memory. This prevents the falsification of datalog data by writing values to datalog registers.
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