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AS1109

Data Sheet - D e t a i l e d D e s c r i p t i o n

Detailed Error Reports

The detailed error report can be read out after global error mode has been run. On the falling edge of LD, the detailed

error report of the selected test is latched into the shift register and can be clocked out with n*8 clock cycles (n is the

number of AS1109s in a chain) via pin SDO. At the same time new data can be written into the shift register, which will

load on the next rising edge of pin LD. This data will show at the output drivers, at the falling edge of OEN.

Detailed Temperature Warning Report

The detailed temperature warning report can be read out immediately after global error mode has been run. Bit0 of the

8bit data word represents the temperature flag of the chip.

Figure 15. Detailed Temperature Warning Report Timing Diagram

Detailed Temperature Warning Report Example

Consider a case where five AS1109s are cascaded in one chain. The detailed error report lists the temperatures for

each device in the chain:

IC1:[70°] IC2:[85°] IC3:[66°] IC4:[160°] IC5:[76°]

In this case, IC4 is overheated and will generate a global error, and therefore 5*8 clock cycles are needed to write out

the detailed temperature warning report, and optionally read in new data. The detailed temperature warning report

would look like this:

XXXXXXX1 XXXXXXX1 XXXXXXX1 XXXXXXX0 XXXXXXX1

The 0 in the detailed temperature warning report indicates that IC4 is the device with the over-temperature condition.

Note: In an actual report there are no spaces in the output.

Global Flag Readout

Detailed Error Report Readout

SDI

OEN

LD

CLK

SDO

New Data Input

DBit7

Undefined

Don’t

Care

Don’t

Care

Temperature Error Report Output

DBit6

DBit5

DBit4

DBit3

DBit2

DBit1

DBit0

TBit0

For detailed timing information see Timing Diagrams on page 9.