xe8802 Semtech Corporation, xe8802 Datasheet - Page 21

• Manufacturer Part Number: xe8802
• Description: Data Acquisition Soc With 16+10 Bit Zoomingadc? Embedded Risc Controller And Lcd Driver
• Manufacturer: Semtech Corporation

2.5 Simplified supply selection criteria
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Figure 2-7. Operating voltage range of the different circuit blocks. MTP devices do not operate below 2.4V. ROM
© Semtech 2006
MTP devices always require the capacitor on VREG and VREG cannot be shorted to VBAT on MTP devices.
ROM devices can operate 1.5 V to 5.5 V with lowest current requirement with the capacitor on VREG, and
VREG not shorted to VBAT.
ROM devices can operate 1.2 V to 3.3 V at highest speed with VREG shorted to VBAT.
If operation is always above 3.0 V, the capacitor on VMULT is not needed and VMULT can be always off.
If the acquisition chain is used between 2.4 V and 3.0 V, then the capacitor on VMULT must be present and
VMULT must be set on during operation below 3.0 V.
The acquisition chain does not operate below 2.4 V.
The internal reference voltage for the LCD does not operate below 1.5 V.
devices can operate in different voltage ranges if VREG and VBAT are short circuited or not.
0
1.2 1.5
CPU
parallel and serial ports
LCD driver and Vgen (no int. ref.)
RC and crystal oscillator
VLD
Comparators
Counters and PWM
ROM
Vgen internal reference
ROM (VBAT≠VREG)
XE8802 Sensing Machine Data Acquisition MCU
(VBAT=VREG)
2.4
acquisition chain
VMULT on
MTP
3.0
acquisition chain
VMULT off
2-8
with ZoomingADC™ and LCD driver
5.5
VBAT (V)
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