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1 2 3 4 DQ CLK RST GND VDD T(hi) T(lo) T(com) 8 7 6 5
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Figure 3-2 DS1620 digital thermometer.
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programs. Do not omit the bypass capacitor not even if you feel that your power supply is solid and well filtered. Locate that cap as close as practical to the supply leads of the DS1620. Although the 1-k resistor is not strictly necessary as long as the firmware is functioning correctly, it s best to leave it in. In the event that both the controller (PIC or STAMP) and the DS1620 try to drive the data line at the same time, the resistor limits the amount of current that can flow between them to a safe value. In order to interface a STAMP to the DS1620, you will need to first activate RST by taking it high. Next you have to send an instruction (protocol) to the DS1620 telling it what you want to do. If you are reading data, shift it into the controller (PIC or STAMP). If you are writing data, shift it out to the DS1620. Finally, you need to deactivate RST by taking it low.
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Linear Technologies LTC1298 12-Bit Analog-to-Digital Converter
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The LTC1298 is a 12-bit analog-to-digital converter (ADC), illustrated in Fig. 3-3. It is internally referenced to the 5-V power supply, providing voltage measurements with 1.22-mV resolution. It has an internal sample-and-hold feature that prevents errors when it is used to measure rapidly changing signals. The 8-pin LTC1298 chip can be configured as a two-channel ADC or single-channel differential ADC. In two-channel mode, the selected channel s voltage is measured relative to ground and returned as a value between 0 and 4095. In differential mode, the voltage difference between the two inputs is measured and returned as a value between 0 and 4095. Supply current is typically 250 A when the unit is operating and 1 nA (one-billionth of an ampere) when it is not. The maximum clock rate for the LTC1298 s three-wire serial interface is 200 kHz, permitting up to 11,100 samples to be taken per second. The LTC1298 interfaces with controllers through 4 pins: chip select (CS), clock (CLK), data in (Din), and data out (Dout). Since PICs can readily switch between input and output on the fly, the interface shown in the figure combines Din and Dout into a single connection. As shown in the figure, the manufacturer recommends a 1- to 10- F bypass capacitor with good high-frequency qualities a ceramic unit at the low end of the scale, tantalum at the higher end. Since the supply voltage also serves as the ADC s voltage reference, it must be well regulated to avoid measurement errors. Since the LTC1298 draws very little current, you may use a precision voltage reference zener diode (such as the LM336) as a regulator. In order to animate the LTC1298, you will first need to activate CS by taking it low. Next you will have to send (shift out) configuration bits to the LTC1298. Now read (shift in) the 12bit measurement from the LTC1298. Finally deactivate CS by taking it high.
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Xicor X25640 8-kbyte EEPROM
The X25640 is an electrically erasable, programmable, read-only memory (EEPROM) device with 8192 bytes (8-kbytes) of storage, in an 8-pin DIP package. Like all EEPROMs,
XICOR X25640 8K EEPROM 41
+5V LTC1298 0 5V input
1 2 3 4
CS CH0 CH1 GND
VCC CLK Dout
8 7 6
Din 5
10- F Tantalum
1K 1 Basic Stamp P0 2 Basic Stamp P1 3 Basic Stamp P2
Figure 3-3 LTC1298 two-channel ADC converter.
it retains data with power off. It is intended for applications in which data is read often and written infrequently, since write operations gradually wear it out. Xicor says that the X25640 will survive a minimum of 100,000 writes. Data stored in the EEPROM should remain intact without power for 100 years or more. EEPROMs are typically used to store calibration tables, control settings, programs, maintenance logs, and small databases (such as lists of telephone numbers in an autodialer) that change fairly infrequently, but must be retained when the power is turned off. The X25640 s relatively large storage capacity, simple interface, and low power consumption (100 A inactive) make it well suited for data logging (see Fig. 3-4). The X25640 s interface is compatible with Motorola s serial peripheral interface (SPI) bus. The basic connections are chip select (CS), which activates the device; serial clock (SCK), which shifts data into or out of it; and data, which consists of the serial in (SI) and serial out (SO) lines tied together. There are two other control lines, hold (HOLD) and write-protect (WP), which are not used in these example applications. HOLD allows a busy, interrupt-equipped processor to pause a transaction with the X25640 while it tends to other business on the SPI bus. WP locks out any attempts to write to the device. Both of these lines are active low, so they are tied to Vcc to disable them. The figure shows how to connect the X25640 to the PIC or STAMP for the demo programs. Do not omit the bypass capacitor not even if you feel that your power supply is solid and well filtered. Locate that cap as close as practical to the supply leads of the X25640. If you omit the bypass cap, you are almost certain to have intermittent communication with the X25640, especially during and after write operations. In order for a STAMP to communicate with the X25640, you will need to first activate CS by taking it low. Next you must send an instruction (opcode) to the X25640 telling it what you want to do. If you are reading or writing a memory location, send the address. If you are reading data, shift it into the controller (PIC or STAMP). If you are writing data, shift it out to the X25640. Finally, you must deactivate CS by making it high.
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