MC33690 データシートの表示（PDF） - Freescale Semiconductor

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MC33690

Standalone Tag Reader Circuit

Freescale Semiconductor 

Oscillator

Table 7. Low-Voltage Reset Specifications

Parameter

Symbol

Test Conditions

and Comments

Min Typ Max Unit Type

Pin LVR

1.6 Low Voltage Reset Low Threshold VLVRON Because the voltage regulator 4.1 4.35 4.6

V

—

1.7 Low Voltage Reset Hysteresis

and the low-voltage reset are

VLVRH using the same internal voltage 50

100 150 mV —

reference, the low-voltage reset

occurs only when the voltage

regulator is out of regulation.

See Figure 11

1.12 Pull-up Current

1.13 Output Resistance in reset condition

1.14 Input Low Voltage

ILVRUP

RLVR

VILLVR

1.15 Input High Voltage

VIHLVR

VLVR = 2.5V

VLVR = 2.5V

—

—

5

10

15 μA —

200 370 500 Ω —

0

— 0.3 x V —

VDD

0.7 x

—

VDD

V

—

VDD

VDD

LVR

VLVRON + VLVRH

VLVRON

Figure 11. Low Voltage Reset Waveform

14 Oscillator

Typical values reflect average measurements at 6V ≤ VSUP ≤ 16V, VSS = 0V, TJ = –40°C to +125°C, unless otherwise noted

Table 8. Oscillator Specifications

Characteristic

Symbol

Test Condition

and Comments

Min Typ Max Unit Type

8.0 Input Capacitance

8.1 Voltage gain VXTAL2 / VXTAL1

8.3 Clock input level

Pins XTAL1, XTAL2

CXTAL1

VXTAL1 = 2.5V

—

AOSC

VXTAL1 = 2.5V

—

VXTAL1 This level ensures the circuit 1.5

operation with an 8 MHz clock.

It is applied through a

capacitive coupling. A 1MΩ

resistor connected between

XTAL1 and XTAL2 biases the

oscillator input.

5

— pF —

25

— ——

—

VDD Vpp —

MC33690 Standalone Tag Reader Circuit, Rev. 5

Freescale Semiconductor

15

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