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DSI621 Programmer

sensor operation without a PC

DSI621 Programmer
The Dallas Semiconductor DS1621 thermometer/thermostat IC can be programmed and read via a two-wire bus. Instead of using a full-blown PC for this purpose, you can use this handy, battery-operated programmer.The Dallas Semiconductor DS1621 is a general-purpose thermometer with thermostat functions. The features of this device have already been fully described in the article ‘Temperature measurements with the DS1621’ in the March 2000 issue of Elektor Electronics. If you missed this issue, you can find the necessary information on the device data sheet, which you can obtain from www.dalsemi.com/datasheets/pdfs/1621.pdf. Here we will only repeat the essentials. All read and write operations for both the thermometer and the thermostat take place via an I2C bus.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
R1,R8,R9 = 10k
R2 = 1k 5
R3 = 10k 4-way SIL array
R4,R5,R6,R11 = 4k 7
R7 = 82k
P1 = 10k preset
C1,C7,C8 = 10µ F 63V radial
C2,C5,C6,C9,C10 = 100nF
C3,C4 = 33pF
D1,D3 = LED, high efficiency
D2 = 1N4001
T1,T2 = BC547B
IC1 = 89C2051-12PC (order code 000159-41)
IC2,IC4* = DS1621 (Dallas) (Farnell # 670704) with holder
IC3,IC5* = 78L05
K1 = LCD module, 2x16 characters (LTN211R-10, LM16A211, LM16A212)
K3,K4,K6 = 8-way IC socket with turned pins and thin connecting leads (Conrad Electronics #189600)
K2,K5 = 4- way SIL pinheader
S1-S4 = Pushbutton, 1 make contact (Multimec D6-Q or Marquardt, Conrad Electronics #706892 with cap)
S5 = slide switch, 1 changeover contact
X1 = 12 MHz quartz crystal
PC1-PC4 = solder pins
9-V PP3 battery with clip-on leads
PCB, order code 000159-1
Disk, all project software, order code 000159-11
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