XE8802MI035LF Semtech, XE8802MI035LF Datasheet - Page 168

• Manufacturer Part Number: XE8802MI035LF
• Description: IC DAS 16BIT FLASH 8K 100-LQFP
• Manufacturer: Semtech

Specifications of XE8802MI035LF

• Applications: Sensing Machine
• Core Processor: RISC
• Program Memory Type: FLASH (22 kB)
• Controller Series: XE8000
• Ram Size: 1K x 8
• Interface: SPI, UART
• Number Of I /o: 36
• Voltage - Supply: 2.4 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• For Use With: XE8000MP - PROG BOARD AND PROSTART2 CARD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

19.7 Partial LCD Driver / Partial Parallel I/O Port
It is perfectly possible to combine different modes described in the previous sections on different pins. Using the
bits LcdSe in the register RegLcdSe, the pins pad_lcd_io[31:0] can be set as parallel port or as LCD drivers. Each
bit sets the mode for 4 pins (see Table 19-4).
When combining the LCD and digital port functions, care has to be taken with the voltage generation. The logical
‘1’ of the digital I/O is driven from the V3 rail and needs to be low impedance. The V3 of the pins used for digital I/O
can not be supplied by the on-circuit voltage multiplier. The next sections show different possibilities.
19.7.1
If V3 in the LCD driver is supplied from a low impedance voltage supply (as e.g. in Figure 19-12(b) or Figure
19-13(b) with connection of Vext to pad_vgen_v3, or in Figure 19-14 and Figure 19-15), the partitioning of the pins
pad_lcd_io[31:0] between the LCD driver function and the digital parallel port function can be chosen freely by
setting the bits LcdSe. Vext may be equal to the circuit supply voltage VBAT but this is not required. The digital I/O
pins use the voltages V0=VSS and V3=Vext for the logical ‘0’ and logical ‘1’ respectively.
© Semtech 2006
vgen_off = 1
vgen_ref_en = 0
VBAT domain
VGEN
Single low impedance voltage for V3 of LCD and digital I/O
1.2V voltage
reference
pad_lcd_io[31:12]
pad_lcd_io[11:4]
pad_vgen_v3
pad_vgen_v2
pad_vgen_v1
pad_vgen_va
pad_lcd_io[3:0]
pad_vgen_vb
pad_lcd_vr1
pad_lcd_vr2
vbat
vss
Figure 19-19. Multi voltage parallel port interface
VDD1 domain
VDD2 domain
VDD3 domain
XE8802 Sensing Machine Data Acquisition MCU
VBAT
VDD1
VDD2
VDD3
19-24
VDD1
I/Os
VDD2
I/Os
VDD3
I/Os
with ZoomingADC™ and LCD driver
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