ADUCM350 datasheet(11/41 Pages) AD

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ADuCM350

Data Sheet

Rev. A | Page 10 of 40

LCD, Charge Pump

Table 18. LCD, Charge Pump Specifications

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

CAPACITANCE

Reservoir Capacitance Between

VLCDVDD and VLCD_GND

0.47

µF

Flying Capacitance

2.2

4.7

Between VLCD FLY1 and VLCD FLY2

VLCD

Switching Voltage

VLCD FLY1

−0.7

VLCD + 0.2

Top of flying capacitor

VLCD FLY2

VCCM

Bottom of flying capacitor

VLCD Charge Pump Switching

Frequency

kHz

Minimum VLCD with Respect to

VCCM_ANA and VCCM_DIG

2.1

When <2.1 V after 62.5 ms elapses indicates

fault condition

VLCDVDD

VLCDVDD Voltage Range

2.4

3.65

5-bit programmable in steps of 40 mV

VLCDVDD Pin Leakage

To VCCM

0.2

To GND

VLCDVDD Start-Up Time

VLCDVDD = 0 V to 3.6 V, reservoir = 1 µF,

flying capacitor = 2.2 nF (minimum) and

4.7 nF (maximum)

VLCDVDD Line Regulation

0.32

V_LCD_xx VOLTAGE RANGE

V_LCD_13 Voltage Range

VLCD ÷ 3 − 10

VLCD ÷ 3 + 10

V_LCD_23 Voltage Range

2/3 VLCD − 13

2/3 VLCD + 13

COMx PINS

DC Voltage Across Segment and

COMx Pins

PIN OUTPUT IMPEDANCE

Segment

2000

Common

130

SYSTEM CLOCKS/TIMERS

The following tables document the system clock specifications in the ADuCM350.

Platform External Crystal Oscillator

Table 19. Platform External Crystal Oscillator Specifications

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

LOW FREQUENCY

CEXT1 = CEXT2

External capacitor, C1 = C2 (symmetrical

load)

Frequency

32,768

HIGH FREQUENCY

CEXT1 = CEXT2

External capacitor

Frequency

8 or 16

MHz

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