BU21028FV-M Datasheet, PDF (12/36 Pages) Rohm – 4-wire Resistive Touch Screen Controller

BU21028FV-M
Power Supply and Reset Timing Specification
A power supply sequence and timing AC characters of BU21028FV-M are below.
BU21028FV-M becomes the reset state at RSTB terminal "L" input and the idle state at RSTB terminal "H" input.
In BU21028FV-M, the communication with the host processor becomes active after internal reset release.
After RSTB= "H" input, please start control of BU21028FV-M after (min: 1.0ms) in waiting time of the internal reset release.
When RSTB terminal becomes the L input, and BU21028FV-M becomes the reset state,
the data of all registers and the touch data become initial value.
After having had a reset state, the initialization of the register and power-on sequence is necessary again.
VDD
VDDP
0V
RSTB
0V
Typ. 3.0V
Trise
VDD*0.8
VDD*0.2
Tdelay1
VDD*0.8
VDD*0.2
Tdelay2
Power-on-reset AC Timing Characteristics (Tj=25℃, VDD=VDDP=3.00V, GND=0.00V, unless otherwise noted)
Parameter
Symbol
MIN
Rating
TYP
Unit
MAX
Condition
VDD rise time
Trise
1
-
10
ms
RSTB rise delay time
Tdelay1
1
-
-
ms
RSTB fall delay time
Tdelay2
0
-
-
ms
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TSZ02201-0L5L0F300720-1-2
27.May.2016 Rev.002