NXP Semiconductors PCF2131-ARD, Руководство пользователя, Страница: 10 / 31

NXP Semiconductors
UM11597
PCF2131-ARD evaluation board
aaa-043565
PCFVDD
VBBS
VDD_3V3
SW4
PTS815
1 4
2 3
SW1
PTS815
1 4
2 3
J15
HDR_2X4
2
4
6
8
CLKOUT
6
TS1
8
TS2
9
TS3
10
TS4
11
BBS
14
VDD
15
VBAT
16
C1
0.1uF
SW3
PTS815
1 4
2 3
J10
HDR 2X5
1 2
3 4
6 5
7 8
9 10
SW2
PTS815
1 4
2 3
C2
0.1uF
PCFVDD
PCFBAT
VBBS
TS1 TS2
TS3 TS4
CLKOUT
TS1
TS2
TS3
TS4
Figure 3. PCF2131-ARD daughterboard, time stamp section
4.8 Power supply
Figure 4 represents the J9 section of the PCF2131-ARD schematic diagram.
aaa-043566
VBBS
VDD_3V3
VDD_3V3
PCFVDD
R5 330 OHM
-
+
BT1
HU2032-LF
2
1
3
C4
0.1uF
J9
HDR 2X5
1
1 1
2
3 4
6 5
5
7 8
9 10
C3
47uF
VBBS
PCFVDD
PCFBAT
PCFVDD
7
C3
47uF
R5 330 OHM
1 1
8 6
Figure 4. PCF2131-ARD daughterboard, J9 section; RC filter detail
J9 has several functions to configure the power rails feeding into PCX2131TF
1. Battery power (VBAT) connection:
When the evaluation board is provided, VBAT pin is grounded with a jumper placed
across J9.1&2. After interface selection (by placing jumpers on J1 or J2), user can
move this jumper to J9.3&4 to connect battery power to VBAT pin.
2. VDD connection:
User can evaluate to have a R/C filter placed before the VDD pin, or bypass the R/C
filter and directly feed VDD_3V3 to VDD pin.
By default, the R/C filter is recommended, and jumpers are placed across J9.6&8,
J9.5&7. The overall circuit is illustrated Figure 5 .
To bypass the R/C filter, place a jumper across J9.5&6.
To measure current consumption, remove the jumper across J9.5&7, and place a
current meter across these two pins.
In some cases, the interface dongle itself can provide its own pullup resistors. If a
dongle is used with this EVM on J4, PCX2131TF could be powered through the
UM11597 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2021. All rights reserved.
User manual Rev. 1.0 — 15 September 2021
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