TMPA901CMXBG Toshiba, TMPA901CMXBG Datasheet - Page 682

• Manufacturer Part Number: TMPA901CMXBG
• Description: Microcontrollers (MCU) 32-bit RISC MCU 16kb ARM926EJ 16kb 200Mhz
• Manufacturer: Toshiba

Specifications of TMPA901CMXBG

• Product Summaries: Summary
• Lead Free: Yes
• Rohs Compatible Product(s): Available
• Rom (kbytes): -
• Rom Type: ROMless
• Ram (kbytes): 32
• Number Of Pins: 177
• Package: BGA
• Vcc: 3V
• Tft Lcd Controller: Y
• Touchscreen Controller: Y
• Usb Host Fs With Phy: Y
• Usb Device Hs With Phy: Y
• Sd Host Controller: -
• Cmos Image Sensor Interface: -
• I2s: 1
• Ssp (ch) Spi: 1
• I2mc/sio (ch): 1
• Uart/sio (ch): 2
• External Bus Interface: Y
• Cs/wait Controller (ch): 4
• Dma Controller: 8
• 10-bit Ad Converter: 4
• 12-bit Da Converter: -
• 16-bit Timer / Counter: 6
• Real Time Clock: Y
• Watchdog Timer: Y
• Osc Freq Detect: Y
• Low-power Modes: Y
• Lead Free Status / Rohs Status: Details

Touch screen resistor
The resistance depends
on the touch screen.
SMY (SMX)
ON-resistor: Rmy (Rmx)
SPY(SPX)
ON-resistor: Rpy (Rpx)
: Rty (Rtx)
3.20.4
10
10
(typ.)
(typ.)
measuring following the procedure below:
X/Y Position Measuring Procedure
<X-position coordinate measurement>
<Y-position coordinate measurement>
During the routine of pen-touch and INTA interrupt generation, execute a pen position
setting, an analog voltage that shows the X position will be input to the PD5/MY/AN5
pin. The X-position coordinate can be measured by converting this voltage into digital
code using the AD converter.
setting, an analog voltage that shows the Y position will be input to the PD4/MX/AN4
pin. The Y-position coordinate can be measured by converting this voltage into digital
code using the AD converter.
measurement above can be determined with the ratio between the ON resistance value
of the switch in the TMPA900CM and the resistance value in the touch screen as shown
in Figure3.20.5
voltage will be neither 3.3 V nor 0 V.
during designing. It is also recommended that an average taken from several AD
conversions performed if required be adopted as the final correct value.
Make the SPX and SMX switches ON, and the SPY and SMY switches OFF. With this
Make the SPY and SMY switches ON, and the SPX and SMX switches OFF. With this
The analog voltage which is input to the AN5 and AN4 pins during the X and Y position
Therefore, even when touching an end area on the touch screen, the analog input
Note that the rate of each resistance varies. Remember to take this into consideration
AVCC3AD
R2
R1
Figure3.20.5 Analog input voltage calculation values
Touch point
AN4 (AN5) pin
3.3 V
TMPA901CM- 681
[Analog input voltage to the AN4 and AN5 pins: Formula to calculate E1]
Example) Where
Note 1: An X-coordinate position can be calculated in the same way
Note 2: Rty R1
AVCC3AD
though above formula is for Y-coordinate position.
E1
E1
((R2
((100
0.698 V
3.3 V, Rpy Rmy
R2
Rmy) / (Rpy Rty
10) / (10
400
100 10)
10
Rmy))
R1 400
AVCC3AD[V]
3.3
TMPA901CM
2010-07-29
and R2
100