Lynsyn Lite HW Description
Some variations exist, your board may be configured differently from the defaults listed here. Information about your specific board can be found in the about-menu of the lynsyn_viewer application.
| Shunt size (Rs) | Current range HW 3.0 | Current range HW 3.1 |
|---|---|---|
| 0.025 ohm | 0A - 1A | 0A - 5A |
| 0.05 ohm | 0A - 500mA | 0A - 2.5A |
| 0.1 ohm | 0A - 250mA | 0A - 1.25A |
The size of the shunt resistors R4-R6 determines the current range of the sensors S1-S3. Best precision and accuracy is achieved when the current range is as small as possible. The shunt resistor must, therefore, be chosen based on the application. The table above shows example shunt sizes and corresponding current ranges. If these ranges are not enough, the following equation can be used to calculate a suitable value for Rs:
HW 3.0: Rs = 0.025 / Imax
HW 3.1: Rs = 0.125 / Imax
The following shunt resistors are mounted as default:
| Sensor | Shunt resistor | Shunt size | Current range HW 3.0 | Current range HW 3.1 |
|---|---|---|---|---|
| S1 | R4 | 0.025 ohm | 0A - 1A | 0A - 5A |
| S2 | R5 | 0.05 ohm | 0A - 500mA | 0A - 2.5A |
| S3 | R6 | 0.1 ohm | 0A - 250mA | 0A - 1.25A |
All power sensors have the same configuration for the voltage sensor. The maximum range of the voltage sensor is set by the voltage dividers R7-R8 (sensor S1), R9-R10 (sensor S2) and R11-R12 (sensor S3). This is by default chosen such that the voltage range is from 0V - 23V.
| Port number | Port Name | Functionality |
|---|---|---|
| J1 | USB | Connects to the host PC |
| J2 | Power sensors | Devices to be measured connects here |
| J3 | Target JTAG | Connects to device to be sampled |
| J4 | Sync | GPIO |
| J5 | Cortex debug | Used for flashing the MCU |