SPC564L54L5 datasheet(116/160 Pages) STMICROELECTRONICS

Part #	SPC564L54L5

Description	32-bit Power Architecture® microcontroller for automotive SIL3/ASILD chassis and safety applications

PDF	160 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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116 / 160 page

Electrical characteristics

SPC56XL60/54

116/160

Doc ID 15457 Rev 8

Equation 4

Equation 4 generates a constraint for external network design, in particular on resistive

path. Internal switch resistances (RSW and RAD) can be neglected with respect to external

resistances.

Figure 9.

Input Equivalent Circuit

A second aspect involving the capacitance network shall be considered. Assuming the three

capacitances CF, CP1 and CP2 are initially charged at the source voltage VA (refer to the

equivalent circuit reported in Figure 9): A charge sharing phenomenon is installed when the

sampling phase is started (A/D switch close).

RS RF

REQ

---------------------

•

---LSB

RSW1

CP2

VDD

Sampling

Source

Filter

Current Limiter

EXTERNAL CIRCUIT

INTERNAL CIRCUIT SCHEME

Source Impedance

Filter Resistance

Filter Capacitance

Current Limiter Resistance

RSW1 Channel Selection Switch Impedance

RAD Sampling Switch Impedance

Pin Capacitance (two contributions, CP1 and CP2)

Sampling Capacitance

CP1

RAD

Channel

Selection

SPC564L54L5 Datasheet(PDF) 116 Page - STMicroelectronics