fma1125dc Fujitsu Microelectronics, Inc., fma1125dc Datasheet - Page 20

• Manufacturer Part Number: fma1125dc
• Description: Touch Sensor Controller
• Manufacturer: Fujitsu Microelectronics, Inc.

Touch Sensor Controller
18
Power Connection
There are two methods to supply power to the FMA1125DC. One is to receive V25 core voltage from an internal LDO and the other is to
receive core voltage from an external power supply. When using the internal LDO, the LDO should be turned on to Sleep mode, which
causes slightly higher power consumption than using an external power supply for V25 core voltage.
Note on case E below, if VPH receives 2.5V, the internal LDO cannot be used because VLDO cannot output 2.5V when VPH receives 2.5V
from the external source.
Power Connection Example for 24QFN, 24SSOP and 24SOP
Fujitsu Microelectronics America, Inc.
Case A.
VDDH: External 5V
VLDO: External 2.5V (Internal LDO Off: Register Control)
Case C.
VDDH: External 3.3V
VLDO: External 2.5V (Internal LDO Off: Register Control)
VDDH
VDDH
VLDO
VLDO
VGG
VGG
V25
V25
GND
GND
2.5V
3.3V
2.5V
5V
Case E.
VDDH: External 2.5V
VLDO: External 2.5V (Internal LDO Off: Register Control)
VDDH
VLDO
External LDO
External LDO
VGG
V25
Confidential
GND
2.5V
Case B.
VDDH: External 5V
VLDO: Internal LDO 2.5V
Case D.
VDDH: External 3.3V
VLDO: Internal LDO 2.5V
External LDO
VDDH
VDDH
VLDO
VLDO
VGG
VGG
V25
V25
10m F
10m F
GND
GND
3.3V
5V
External LDO
External LDO