MC33794 查看數據表（PDF） - Freescale Semiconductor

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MC33794

Electric Field Imaging Device

Freescale Semiconductor 

Table 1. SOICW-EP TERMINAL FUNCTION DESCRIPTION (continued)

Terminal

Terminal

Name

Formal Name

Definition

32

GND

Ground

This terminal and metal backing is the IC power return and thermal radiator/

conductor.

35

TEST

Test Mode Control

This terminal is normally connected to circuit ground. There are special

operating modes associated with this terminal when it is not at ground.

36 – 44

E1 – E9

Electrode Connections

These are the electrode terminals. They are connected either directly or through

coaxial cables to the electrodes for measurements. When not selected, these

outputs are grounded through the internal resistance.

45, 46

47

REF_A,

REF_B

(E10, E11)

ISO_OUT

Reference Connections These terminals can be individually selected to measure a known capacitance

(Or as additional electrodes) value. Unlike E1-E9, these two inputs are not grounded when not selected.

ISO-9141 Output

This terminal translates ISO-9141 receive levels to 5.0 V logic levels for the

MCU.

51

ISO_IN

ISO-9141 Input

This terminal accepts data from the MCU to be sent over the ISO-9141

communications interface. It translates the 5.0 V logic levels from the MCU to

transmit levels on the ISO-9141 bus.

53

ISO-9141

ISO-9141 Bus

This terminal connects to the ISO-9141 bus. It provides the drive and detects

signaling on the bus and translates it from the bus level to logic levels for the

MCU.

54

LAMP_CTRL

Lamp Control

This signal is used to control the lamp driver. A high logic level turns on the lamp.

Sensors

Freescale Semiconductor

MC33794

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