Kernel driver powr1220¶
Supported chips:
Lattice POWR1220AT8
Prefix: ‘powr1220’
Addresses scanned: none
Datasheet: Publicly available at the Lattice website
Author: Scott Kanowitz <scott.kanowitz@gmail.com>
Description¶
This driver supports the Lattice POWR1220AT8 chip. The POWR1220 includes voltage monitoring for 14 inputs as well as trim settings for output voltages and GPIOs. This driver implements the voltage monitoring portion of the chip.
Voltages are sampled by a 12-bit ADC with a step size of 2 mV. An in-line attenuator allows measurements from 0 to 6 V. The attenuator is enabled or disabled depending on the setting of the input’s max value. The driver will enable the attenuator for any value over the low measurement range maximum of 2 V.
The input naming convention is as follows:
| driver name | pin name |
|---|---|
| in0 | VMON1 |
| in1 | VMON2 |
| in2 | VMON3 |
| in2 | VMON4 |
| in4 | VMON5 |
| in5 | VMON6 |
| in6 | VMON7 |
| in7 | VMON8 |
| in8 | VMON9 |
| in9 | VMON10 |
| in10 | VMON11 |
| in11 | VMON12 |
| in12 | VCCA |
| in13 | VCCINP |
The ADC readings are updated on request with a minimum period of 1s.