ADC0804 8-bit A/D converter pinout
DIP-20. Converts the sense voltage to a byte on HERO 1. Sense board U602.
An 8-bit converter on the HERO 1 sense board. Its output reaches the CPU on $C240. The sound/light switch picks which analog source feeds it, and the converter is powered only through the sense rail. An unpowered converter reads all ones, so a constant $FF usually means no supply.
Open the interactive ADC0804 pinoutPins
| Pin | Name | Type | Signal |
|---|---|---|---|
| 1 | /CS | ctrl | Chip select, active low. |
| 2 | /RD | ctrl | Read output, active low. |
| 3 | /WR | ctrl | Write (start conversion), active low. |
| 4 | CLK IN | clock | Clock input. |
| 5 | /INTR | ctrl | Conversion done, active low. |
| 6 | VIN+ | ctrl | Analog input, positive. |
| 7 | VIN- | ctrl | Analog input, negative. Ground for single-ended use. |
| 8 | AGND | ground | Analog ground. |
| 9 | VREF/2 | ctrl | Reference voltage divided by two. |
| 10 | DGND | ground | Digital ground. |
| 11 | DB7 | data | Data bit 7 (MSB), tri-state output. |
| 12 | DB6 | data | Data bit 6. |
| 13 | DB5 | data | Data bit 5. |
| 14 | DB4 | data | Data bit 4. |
| 15 | DB3 | data | Data bit 3. |
| 16 | DB2 | data | Data bit 2. |
| 17 | DB1 | data | Data bit 1. |
| 18 | DB0 | data | Data bit 0 (LSB). |
| 19 | CLK R | clock | Clock resistor node. |
| 20 | VCC | power | +5 V supply. Sense rail on HERO 1. |
Fitted in
- HERO 1 U602 (sense board)