UM10412
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© NXP B.V. 2010. All rights reserved.
User manual
Rev. 1 — 2 November 2010
6 of 26
NXP Semiconductors
UM10412
UBA2021 evaluation board
4. Schematics
is a schematic of the daughter board with the UBA2021 IC. The component
values for the oscillator and sweep are RREF = 30 k
Ω
, CF = 100 pF, CP = 330 nF. These
values will give a minimum oscillator frequency of 39.5 kHz and a preheat time of 1.85 s.
Fig 4.
Daughter board with UBA2021 circuit
019aaa284
30 k
Ω
R3
C1
A1
100 nF
C2
330 nF/16 V
C3
100 pF
1
2
47
Ω
R4
2
1
150 k
Ω
R1
1
2
150 k
Ω
R2
1
2
160 k
Ω
R8
1
2
2
1
2
1
2
CI
13
1
14
RHV
Vbrg
SH
C4
C6
470 pF/
500 V
100 nF
V1
V2
BAS29
V3
BAS29
X2
TP
BAS29
1
2
1
2
C8
1 nF/
100 V
1
2
1
2
C7
1
μ
F/
25 V
1
2
C9
10 nF/
50 V
1
2
1
Pin 11 is cut off
for correct insertion
2
X1
header 13
C10
2.2 nF/
100 V
1
2
1
E
E
C
C
13
B
B
2
R6
1 k
Ω
R5
10 k
Ω
V5
BC847C
V4
BC857C
R7
3.3 k
Ω
1
1
2
2
C5
DNP
1
2
2
1
UBA2021P
2
G1
GH
3
S1
PCS_2021
1
FS
6
G2
GL
4
n.c.
5
VS
VDD
7
PGND
CP
8
CF
12
RREF
10
SGND
11
RS
9
12
11
10
9
8
7
6
5
PCS_2021
GL
Vbrg
GH
SH
4
3
2
1
