UM-B-065
Bluetooth® Smart Communication Interface Board
User manual
Revision 1.0
11-May-2016
CFR0012
10 of 24
© 2016 Dialog Semiconductor
Figure 10: Schematic of the Reset and UART/JTAG discharge circuitry
4.3.3
Target board power supply
– ON/OFF switch (SW2)
SW2
is a two-position switch which connects VLDO (output line of the LDO
U2
), with the connectors
J4, J5
and consequently the target board. In
SW2
is set to OFF, which means that the
target board is not powered from CIB. When the switch is in position ON, the target board is supplied
with power from CIB. Also, by using this switch we can generate a Power on Reset signal (described
in section
).
Figure 11: The actual Power supply switch (SW2)
4.3.4
LEDs
For the positions of the LEDs on the CIB, see
●
The VDD LED (
D3
) indicates that target board is supplied from:
○
CIB, when switch
SW2
is set to ON.
○
An external power supply (switch
SW2
is OFF
and
jumper placed on
J16
).
●
The VPP LED (
D7
) indicates that the VPP pin of the target board is powered with 6.8 V.
●
The
D5
LED is switched off for 10 ms once per second and indicates J-Link
“heart beat”. It is
activated after the emulator has been in idle mode for at least 7 s.
●
The
D4
LED indicates that Reset is active on the target.
4.3.5
Headers and jumpers
Header J14:
●
Place the jumper on the
J14
header for VDD Voltage = 3 V and GPIO voltage = 3 V.
●
Remove the jumper from the
J14
header for VDD Voltage = 1.8 V and GPIO voltage = 1.8 V.
TP68
IND
Q6
DMG3402L-7
1
2
3
Q7
DDTC144EUA-7
1
2
3
VLDO
VDD
R69
10.0k
R70
Mohm: 10M
R71
1.00k
U16
NC7SB3157P6X
B1
1
GND
2
B0
3
A
4
VCC
5
S
6
RST
VLDO
R43
1.00k
U5
NC7SZ04P5X
NC
1
I
2
GND
3
O
4
VCC
5
VLDO
TARGET RESET / UART & JTAG PINS DISCHARGE
C6
100nF
R47
51.0k
Q4
DDTC144EUA-7
1
3
2
Q5
DDTC144EUA-7
1
3
2
Q2
DDTC144EUA-7
1
3
2
Q1
DDTC144EUA-7
1
3
2
SW1
RESET
TP9
INV_RESET
R86
30k
C42
100nF
RST
T-RESET
State of signals for Resetting Target Board
UTX
Q1, Q2, Q4, Q5
DDTC144EUA-7
Schematic
SWCLK
SWDIO
URX
T-RESET
IND
IND
