fma1127dc Fujitsu Microelectronics, Inc., fma1127dc Datasheet - Page 24

• Manufacturer Part Number: fma1127dc
• Description: Touch Sensor Controller
• Manufacturer: Fujitsu Microelectronics, Inc.

Touch Sensor Controller
22
Power Sequence
To initialize the FMA1127DC properly, please refer to the Power Sequence below when the power is given initially during boot-up.
If the reset transition time during power on does not follow the time sequence below, the Internal LDO and oscillator would not operate
normally.
The Power Sequence is based on the Power Connection type and is shown in the following example.
Power Connection Type is Case B or Case D
Power Connection Type is Case A, Case C, or Case E
In order to delay RESET_N transition about 0.1msec than VDDH transition, 10KΩ resistor and 1uF capacitor should be attached on
RESET_N pin. Please see the typical application circuits described in the previous chapter. Also note that pulse width of RESET_N which is
active low and generated by MCU must be longer than 0.1msec to be valid RESET signal.
Fujitsu Microelectronics America, Inc.
RESET_N
VDDH(IO)
VDDH (2.5V or 3.3V or 5.5V) x 0.9
V25(Core)
RESET_N
VDDH(IO)
VDDH (3.3V or 5.5V) x 0.9
V25 (2.5V) x 0.9
Fixed “L”
Fixed “L”
Reset Period
Min 0.1 msec
Reset Period
Min 0.1 msec
GND + 0.3V
GND + 0.3V