current - What does this circuit symbol mean? (Circle with horizontal line through it)

I came across the following symbol in a datasheet (functional block diagram on page 8). What does it mean?

For future searchers, the symbol is a circle with a horizontal line (diameter) through it.

Does it just indicate that the current through the branch has a particular value? A current limit? Something else? Thanks.

Answer

It's a fixed current source (DIN 40700 style). With an arrow pointing to it an externally controlled current source. In this case it's a CCCS (Current Controlled Current Source), where the generated current is the controlling current divided by 500, resp. 1000, depending on the device.

Other common current source symbols include:

Controlled current sources may be indicated by:

or