User Manual Part 1

CY8CKIT-042-BLE Bluetooth® Low Energy (BLE) Pioneer Kit Guide, Doc. # 001-93731 Rev. *A 89
Hardware
An adjustable LDO is used to output three different voltage levels (1.9 V, 3.3 V, and 5 V) to power the
BLE module. These voltages are selected with the J16 jumper, as shown in Figure 5-1.
Figure 5-1. Schematics and Board Highlight of LDO and Power Selection Jumper
The input to the LDO can come from either the USB, the VIN pin in the Arduino header J1 or header
J9.
Note: The typical dropout voltage of the selected LDO is 0.3 V at 500-mA output current. This gives
a minimum output of 4.6 V from the input voltage of 5 V from the VBUS. This drop also takes into
account the voltage drop across the Schottky diode connected at the output of the LDO to protect
against voltage applied at the output terminal of the regulator.
VADJ VDD
VCC
EN_CTRL
EN_CTRL
VBUS
VIN
VCC
EN_CTRL
NO LOAD NO LOAD
1
2
3
4
5
6
CTL
VCC
N.C.
OUT
C
GND
Output Voltage ON / OFF control
Power supply voltage input
Unconnected terminal
Voltage output
Output voltage regulation terminal
Ground
Pin No Symbol Function
.
TABLE: LDO PIN FUNCTIONS
GND Test Points
TABLE: VOLTAGE SELECTION JUMPER SETTINGS
JUMPER SETTING O/P VOLTAGE
SHORT 2 & 3
SHORT 1 & 2
REMOVE JUMPER
3.3V
5V
1.9V
TP5
BLACK
SOD123
D1
U1
BA00BC0WFP-E2
VCC
2
CTL
1
NC
3
OUT
4
C
5
GND
6
R1
11K
1%
R4
10K 1%
+
3216
C2
4.7uF
R10
10K
R3
14.7K 1%
SOD123
D4
SOD123
D2
TP6
BLACK
R5
4.3K 1%
TP4
BLACK
J16
3 PIN HDR
1 3
2
+
3216
C1
1 uFd
SOD123
D3