Z8F042AHH020EG Zilog, Z8F042AHH020EG Datasheet - Page 182

• Manufacturer Part Number: Z8F042AHH020EG
• Description: IC ENCORE XP MCU FLASH 4K 20SSOP
• Manufacturer: Zilog
• Series: Encore!® XP®r

Specifications of Z8F042AHH020EG

• Core Processor: Z8
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: IrDA, UART/USART
• Peripherals: Brown-out Detect/Reset, LED, LVD, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 17
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 7x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 20-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 269-4156; Z8F042AHH020EG

PS022517-0508
Figure 35. Connecting the On-Chip Oscillator to an External RC Network
An external resistance value of 45 kΩ is recommended for oscillator operation with an
external RC network. The minimum resistance value to ensure operation is 40 kΩ. The
typical oscillator frequency can be estimated from the values of the resistor (R in kΩ) and
capacitor (C in pF) elements using the below equation:
Figure 36
function of the capacitor (C in pF) employed in the RC network assuming a 45 kΩ exter-
nal resistor. For very small values of C, the parasitic capacitance of the oscillator XIN pin
and the printed circuit board should be included in the estimation of the oscillator fre-
quency.
It is possible to operate the RC oscillator using only the parasitic capacitance of the pack-
age and printed circuit board. To minimize sensitivity to external parasites, external capac-
itance values in excess of 20 pF are recommended.
Oscillator Frequency (kHz)
on page 170 displays the typical (3.3 V and 25
V
DD
=
--------------------------------------------------------------- -
(
R
C
0.4
×
R
X
1
×
IN
×10
C
)
6
+
(
4
×
C
)
Z8 Encore! XP
0
C) oscillator frequency as a
Product Specification
®
On-Chip Oscillator
F0822 Series
169