DS1624 PDF

The thermometer provides bit temperature readings which indicate the temperature of the device. The E2 memory allows a user to store frequency compensation coefficients for digital correction of crystal frequency due to temperature. Any other type of information may also reside in this user space. No connect.

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Create and study BOM, powerlist and netlist Use as few different components as possible. It will also reduce the risk of mounting the wrong components. Print the BOM, check the resistor values used and see if you can remove some values by putting them in parallel or series or actually taking existing values that are as good.

The same for capacitors cf. Check if high precision or high power components that are used e. Avoid through-hole components as they should be manually mounted. See if potentiometers in the final design can be replaced by a fixed value resistor reduces production and calibration costs. Print out the netlist, sort alphabetically and check for any inconsistencies in naming, bus signals all used.

This takes some time, but really can show non-obvious mistakes. For any newly created symbols, check the pin numbering. CERN specific: check if only symbols created by the design office are used. Verify that the BOM is describing fully the components used. Manufacturer, Manufacturer full ordering number including package and speed : e. For generic components: all parameters are defined in the symbol: e.

If not, create the correct symbol. Non-mounted components should be marked in the schematics as such. And it should be clear from the BOM that they should not be mounted.

Study schematics Buses: check if all bits are used. Check each connection of ICs. Add a note. Check polarity of capacitors, notably on those connected to negative power supplies. Check correct polarity of diodes and LEDs.

Check if enough decoupling for each IC. Check global decoupling of power supplies large cap at point of generation or entry.

Check protection circuits on the signals. Verify in detail where current flows through. Check if direction of signals correct i. Check if components are aligned to make the schematics look clear. Check consistency of naming and numbering of schematic pages. Check for testability: can all signals be tested on a production test system e. Check if version or revision of a PCB can be accessed via gateware. Schematics conventions Use same page size e. Check that schematics read from left to right.

Make the signals flow that direction: i. Align components on a page. Show clearly from which power supply each component is powered. Power symbol for positive supply should point up.

Those for negative supplies and GND should point down. Clock signals: add frequency in name eg. Number components simply, like R1, R3, C1, L1 etc. Do not use names like Rbias1 and Cin2 as one may see used in datasheets. Unused signals available on connectors e. Mark resistor values as follows: 47 for 47 Ohm , 4R7 for 4. Have a note on the schematic about allowed Vadj level e. Foresee decoupling capacitors near the FMC connector allowing power pins to work as signal return too.

Connect all mounting holes to ground this is not in the specification, but is the best practice. Documentation Check that each schematics page has on the same place the Open Hardware Licence text of its corresponding variant -S, -W, -P : "Copyright mycompany Make sure that all texts, indications and annotations are written in English.

Check and remove any DRC error flags. Document all inputs and outputs on the schematics pages voltage and current on external power connectors voltage level and input impedance on coax inputs voltage level and output impedance or drive level on outputs make clear which connector type is used.

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Create and study BOM, powerlist and netlist Use as few different components as possible. It will also reduce the risk of mounting the wrong components. Print the BOM, check the resistor values used and see if you can remove some values by putting them in parallel or series or actually taking existing values that are as good. The same for capacitors cf. Check if high precision or high power components that are used e. Avoid through-hole components as they should be manually mounted. See if potentiometers in the final design can be replaced by a fixed value resistor reduces production and calibration costs.

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