AN4505 datasheet(12/43 Pages) STMICROELECTRONICS

Part #	AN4505

Description	This document is intended to provide usage information

PDF	43 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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Reading angular rate data

AN4505

12/43

DocID026441 Rev 1

3.5

Level-sensitive/edge-sensitive data enable (DEN)

The L3GD20 allows external trigger level recognition by enabling the EXTRen (bit 7) and

LVLen (bit 6) bits in RESERVED (11h). Two different modes can be used: level-sensitive or

edge-sensitive trigger. The DEN input signal is driven on pin 8 (Reserved).

3.5.1

Level-sensitive trigger stamping (LVLen = 1; EXTRen = 0)

Once enabled, the DEN logical value replaces the less significant bit of X, Y and Z data for

the axis selected through the Xen, Yen, Zen bits in CTRL_REG1 (20h) until the DEN logical

value is kept high.

Data are stored inside the FIFO with the internally selected ODR.

Figure 2. Data synchronization: level sensitive

Figure 3. Level-sensitive trigger stamping

Table 6. DEN configurations

EXTRen

LVLen

Function

Level sensitive

Edge sensitive

AN4505 Datasheet(PDF) 12 Page - STMicroelectronics