Schematics

VCC1
1
INA1
2
INB1
3
VDD1
4
VCC2
5
INA2
6
INB2
7
VDD2
8
OUTB2
9
AGND2
10
PGND1
11
OUTA1
12
OUTB1
13
AGND1
14
PGND1
15
OUTA1
16
U2-3
MX1919-SOP16
C2/
104
C1/
100uF6V
6V VCC
1 3
2
U4
3.3V
VDD 3.3V
+
C4/
470UF
6V VCC
C3/
104
6V VCC
C5
104
A
-
+
MG1
FB
C6
104
A
-
+
MG2
LR
3.3V
3.3V
Y1
16M
BACK
LEFT
RIGHT
FORWARD
VDD 3.3V
C1
104
L1
2.2NH
C3 0.75PF
ANT
C2
1PF
BACK
LEFT
RIGHT
FORWARD
C4
225P
R1
560
LED1
LED
PA6
PA6
662K 3.3V
1
2
3
4
5
6
7
8 9
10
11
12
13
14
15
16
VSS
AVDD
XC1
XC2
DVDD
PA6
PRSTB
PA3 PA4
PA0
PB0
PB1
PB3
RVDD
ANTB
ANT
U1
XC2500
VDD 3.3V
51552/3/4-RX