AS1113-BQFT Ver la hoja de datos (PDF) - austriamicrosystems AG

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AS1113-BQFT

50mA, 16-Channel LED Driver with Diagnostics

austriamicrosystems AG 

AS1113

Data Sheet - Detailed Description

Detailed Error Reports

The detailed error report can be read out after global error mode has been run. At 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*16 clock cycles (n is the

number of AS1113s in a chain) via pin SDO. At the same time new data can be written into the shift register, which is

loaded on the next rising edge of pin LD. This pattern is shown 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. SDI must

be 1 for the first device. Bit0 of the 16bit data word represents the temperature flag of the chip.

Figure 13. Detailed Temperature Warning Report Timing Diagram

OEN

LD

CLK

Global Flag Readout

tGSW(ERROR)

t(SU)ERROR

Detailed Error Report Readout

tH(L)

tP4

SDI

DBit15 DBit14 DBit13 DBit12 DBitn DBit2 DBit1 DBit0

New Data Input

SDO

TFLAG

Undefined

TBit0

tP4

Temperature Error Report Output

tP1

For detailed timing information see Timing Diagrams on page 9.

Don’t

Care

Don’t

Care

Detailed Temperature Warning Report Example

Consider a case where four AS1113s are cascaded in one chain. The detailed error report lists the temperatures for

each device in the chain:

IC1:[70°] IC2:[85°] IC3:[170°] IC4:[60°]

In this case, IC3 is overheated and will generate a global error, and therefore 4*16 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:

XXXXXXXXXXXXXXX1 XXXXXXXXXXXXXXX1 XXXXXXXXXXXXXXX0 XXXXXXXXXXXXXXX1

The 0 in the detailed temperature warning report indicates that IC3 is the device with the over-temperature condition.

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

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