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Sheet目录3887

72页 73页 74页 75页 [76页]77页 78页 79页 80页

168

8048C–AVR–02/12

ATtiny43U

21. Typical Characteristics

The data contained in this section is largely based on simulations and characterization of similar

devices in the same process and design methods. Thus, the data should be treated as indica-

tions of how the part will behave.

The following charts show typical behavior. These figures are not tested during manufacturing.

During characterisation devices are operated at frequencies higher than test limits but they are

not guaranteed to function properly at frequencies higher than the ordering code indicates.

All current consumption measurements are performed with all I/O pins configured as inputs and

with internal pull-ups enabled. Current consumption is a function of several factors such as oper-

ating voltage, operating frequency, loading of I/O pins, switching rate of I/O pins, code executed

and ambient temperature. The dominating factors are operating voltage and frequency.

A sine wave generator with rail-to-rail output is used as clock source but current consumption in

Power-Down mode is independent of clock selection. The difference between current consump-

tion in Power-Down mode with Watchdog Timer enabled and Power-Down mode with Watchdog

Timer disabled represents the differential current drawn by the Watchdog Timer.

The current drawn from pins with a capacitive load may be estimated (for one pin) as follows:

where V

CC = operating voltage, C

L = load capacitance and fSW = average switching frequency of

I/O pin.

21.1

Boost Converter

The following characteristics were obtained with components listed in Table 21-1. See Figure 8-

8 on page 42 for component placement.

Note:

1. The rather large capacitance of C1 was required to minimize input ripple caused by a shunt

resistor used in the measurement system.

ATtiny43U devices used in the measurements were packaged in SOIC case and had a switch-

ing frequency of 100kHz.

≈

Table 21-1.

Components Used During Characterisation of Boost Converter.

Part

Type

Value

6 x JMK212BJ106KD-T

6 x 10 F = 60 F(1)

100 nF

JMK212BJ226MG-T

22 F

100 nF

PMEG2010AEH

VF = 0.35V

LPS6235-153MLB

15 H

680 k

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