Atmel SAM4S-EK2 Atmel ATSAM4S-EK2 ATSAM4S-EK2 Data Sheet

11176A–ATARM–24-Sep-12

Figure 4-11.  JTAG Interface

The SAM4S-EK2 board supports both audio recording and playback. 

The audio volume can be adjusted using the potentiometer RV1, and the microphone amplifier gain can 
be adjusted via jumpers (fixed gain of 24 or 26 dB).

The embedded microphone is connected to an audio pre-amplifier using the TS922 operational amplifier 
(MN11). The gain is set by using JP14 and JP15 jumpers; both must be set or removed at the same 
time.

By modifying the jumper positions, you can select each of the following gain values:

„

20 dB (default setting, both JP14 and JP15 are off)

„

26 dB (both JP14 and JP15 are on).

R83 is a default 0 Ohm resistor that enables the disconnection of PB0 from the audio 
input path for custom usage.

The audio pre-amplifier MN11 is powered by a dedicated low dropout regulator 
MIC5219-3.3 (MN14).

+3V3

DGND

NRST

PB5

PB7

PB6

PB4

R43
100K

R43
100K

R41
100K

R41
100K

R39
100K

R39
100K

J6

J6

VTref

1

Vsupply

2

nTRST

3

GND1

4

TDI

5

GND2

6

TMS

7

GND3

8

TCK

9

GND4

10

RTCK

11

GND5

12

TDO

13

GND6

14

nSRST

15

GND7

16

DBGRQ

17

GND8

18

DBGACK

19

GND9

20

R42
100K

R42
100K

R40
100K

R40
100K

R44

0R

R44

0R