Scan
| Address | Plain read | 16-bit register | SMBus command |
|---|
Every address is tried three ways, because a part that refuses one shape may answer
another: a plain address-only read, a 16-bit register read as the array sensors want,
and a one-byte command read as SMBus parts want. An address is listed if any of the
three is acknowledged.
Lines
SCL
—
SDA
—
Drives the connector pins as plain outputs so a line can be held while somebody
measures at the chip's own pins. A line that stays high at the chip while held low
here is not connected. The bus is unusable until released — and a held line blocks
every device on it, so release before scanning.
Stimulus
Repeats one identical transaction so a scope or logic analyser has a stable trigger.
Watch the ninth clock: the slave pulls SDA low there to acknowledge, and a line that
stays high is a part that is not answering.
Board
- Status
- Disconnected
- Board
- —
- Firmware
- —
- Supply
- —
This rail feeds the SPI side. The I2C connector is powered independently, so a
silent I2C part is never explained by this setting.
Send
Any SCPI command, verbatim. Up and down recall what was sent before.