Chip Connection Instructions
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Below is a summary of recommended schematic connections for each IC. These ensure proper power, ground, and I²C operation. You can use the “Apply changes” button to add and connect the missing components and nets in your schematic.
1. U2 (U2) EEPROM
- Supply & Ground:
- Address & Write Protect:
- Tie A2 (pin 3) to Ground for the standard address (0x50).
- Tie WP (pin 7) to Ground to enable writes.
- I²C Signals:
2. U3 (U3) 16-Bit DAC
- Power & Ground:
- Reference & Output:
- Connect VREF (pin 2) to +3.3V for full-scale range (or another reference if desired).
- Tie V(SENSE) (pin 3) to the same net as VREF (pin 2) for proper sensing.
- Address & I²C Signals:
3. U5 (U5) RTC
- Power & Ground:
- Battery Backup (optional):
- If no backup battery is used, connect VBAT (pin 3) to +3.3V. Otherwise, use a coin cell or backup supply as specified in the datasheet.
- I²C Signals:
- Oscillator Pins (optional 32.768kHz crystal):
- Wire a 32.768kHz crystal between OSCI (pin 1) and OSCO (pin 2).
- Add two small load capacitors (e.g., 12-15pF) from each crystal pin to Ground.
4. Pull-Up Resistors (if needed)
If you need external I²C pull-ups instead of relying on the Pi’s internal ones, add two resistors (e.g., 4.7kΩ or 10kΩ) from SCL and SDA to +3V3.
If you need external I²C pull-ups instead of relying on the Pi’s internal ones, add two resistors (e.g., 4.7kΩ or 10kΩ) from SCL and SDA to +3V3.
Use the "Apply changes" button to add and wire these components and nets in your schematic.
Connect all I²C chips
Wire U2 EEPROM
Implement I²C connections
Apply connection changes
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