ASI4U datasheet(60/71 Pages) RENESAS

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ASI4U / ASI4U-E / ASI4U-F Datasheet

January 26, 2016

Table 4.29 CAP Pin Parameters

PARAMETER

SYMBOL

CONDITIONS

MIN

Typical

MAX

UNIT

Input voltage range

VCAP_IN

-0.3

VU5R

External decoupling capacitor

CCAP

Note: In some applications, a resistor connected in series with CCAP might improve the impedance behavior of the internal electronic

inductor. Depending of the application, this resistor must be dimensioned in the range of 10

Ω to 100Ω.

The decoupling capacitor defines an internal low-pass filter time constant; lower values decrease the impedance but improve the turn-on

time. Higher values do not improve the impedance but do increase the turn-on time.

The turn-on time also depends on the load capacitor at UOUT. After connecting the slave to the power, the capacitor is charged with the

maximum current IUOUT. The impedance will increase when the voltage allows the analog circuitry to fully operate.

4.19. Thermal and Overload Protection

The IC continuously observes its silicon die temperature. If the temperature rises above approximately 140°C for

more than 2 seconds, the IC will be put into shutdown and stay there until the next power-on reset occurs.

The circuit is also shut down if UOUT pin is overloaded (e.g., shorted to GND) for more than 2 seconds.

Table 4.30 Shutdown Temperature

PARAMETER

SYMBOL

CONDITIONS

MIN

MAX

UNIT

Chip temperature for over-temperature shut down

TShut

125

160

°C

Application Circuits

The following figures show typical application cases for the ASI4U. Note that these schematics show only basic

circuit principles. For more detailed application information, see the ASI4U Application Note – Evaluation Board.

Figure 5.1 outlines a standard slave application circuit. Figure 5.2 shows an extended power application circuit

with an externally decoupled sensor supply. A Master/Repeater Mode application is shown in Figure 5.3.

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