EM78P568

8-bit OTP Micro-controller

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* This specification are subject to be changed without notice.

53

01/31/2004

V4.7

OSC and reset timing characteristics (see Fig.25 for details)

Description

Symbol

Min

Typ

Max

Unit

Oscillator timing characteristic

OSC start up

32.768kHz

Toscs

400

1500

ms

3.579MHz PLL

5

10

us

Reset timing characteristic

The minimum width of reset low pulse

Trst

3

uS

The delay between reset and program start

Tdrs

18

mS

Embedded LCD driver

Symbol

Parameter

Condition

Min

Typ

Max Unit

Frame

LCD frame frequency

1/8, 1/16 duty

64

Hz

TONE generators for AC Characteristic (AVDD=VDD=5V,Ta=+25

°C)

CHARACTERISTIC

Min

Typ

Max

Unit

Tone1/Tone2 signal strength (root mean square voltage)

Tone1 signal strength V1rms (ps1) ~= -14dBm (600Ω)

130

155

180

mV

Tone2 signal strength V2rms (ps1) ~ = -12dBm (600Ω)

1.259V1rms

mV

Tone twist

(Tone1 – Tone2) twist

-2

dB

(ps1) : V1rms and V2rms has 2 dB difference. It means 20log(V2rms/V1rms) = 20log1.259 = 2 (dB)

CTCSS block (AVDD=VDD=5V,Ta=+25

°C)

Parameter

Min.

Typ. Max.

Unit

RX mode

Zero crossing threshold (mVrms) (note : 1*)

20

mV

Data Duty Ratio

30

50

70

%

TX mode

CTCSS tone (form Tone 2) to VTX3, for 600Ω

-12

dBm

CTCSS tone to MTX, for 600Ω

-22

dBm

Filter

BPF for Audio

Pass-Band Frequency

300

3400

Hz

Pass-Band Ripple

1.0

dB

LPF for Sub-Audio

Pass-Band Frequency

60

253

Hz

Pass-Band Ripple

1.0

dB

Output

Driving capacity for AURX pin

30

uA

Driving capacity for MTX pin

30

uA

Output loading impedance for AURX pin

(Ref. Voltage = 2.5V)

42

k

Ω

Output loading impedance for MTX pin

(Ref. Voltage = 2.5V)

42

k

Ω

Note :

1*. Test under Fig.26 application circuit. Zero crossing threshold means ZC’s transition level in Fig.14 CTCSS

block. This level is close but not equal to CTCSS receiving sensitivity. The CTCSS receiving sensitivity

partially depends on user software judgement. Also CTCSS receiving sensitivity can be adjusted by changing

external resistors of RX AMP in Fig.26 application circuit.