fma1127da Fujitsu Microelectronics, Inc., fma1127da Datasheet - Page 23

• Manufacturer Part Number: fma1127da
• Description: Touch Sensor Controller
• Manufacturer: Fujitsu Microelectronics, Inc.

Power Connection
There are two methods to supply power to the FMA1127DA touch sensor controller. One is to receive V25 core voltage from internal LDO and
the other is to receive core voltage from an external power supply. In the case of using internal LDO, the LDO should be turned on in Sleep mode
and hence it will cause slightly higher power consumption than using an external power supply for V25 core voltage.
In Case E, if VPH receives 2.5V, internal LDO can not be used because VLDO can not output 2.5V when VPH receives 2.5V from external LDO.
Case A.
VPH: External 5V
VLDO: External 2.5V (Internal LDO Off: Register Control)
Case C.
VPH: External 3.3V
VLDO: External 2.5V (Internal LDO Off: Register Control)
VLDO
VLDO
VGG
VGG
VPH
VPH
V25
V25
IO interface to over chip is 3.3V
IO interface to over chip is 5V
GND
GND
2.5V
3.3V
2.5V
5V
Case E.
VPH: External 2.5V
VLDO: External 2.5V
VLDO
External LDO
External LDO
VGG
VPH
V25
IO interface to over chip is 2.5V
GND
2.5V
Case B.
VPH: External 5V
VLDO: Internal LDO 2.5V
Case D.
VPH: External 3.3V
VLDO: Internal LDO 2.5V
External LDO
VLDO
VLDO
VGG
VGG
VPH
VPH
V25
V25
IO interface to over chip is 3.3V
IO interface to over chip is 5V
10µF
10µF
GND
GND
3.3V
5V
External LDO
External LDO
FMA1127DA
Fujitsu Microelectronics America, Inc.
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