4-5

+5V

HIP9010

MICROPROCESSOR

SPI BUS

C3, 0.022

µF

C2, 3.3nF

C1, 3.3nF

R1

R4

R3

4MHz

A/D

CONVERTER

GND

S1IN

S1FB

S0IN

S0FB

OSCIN

OSCOUT

INTOUT

MOSI

MISO

SCK

CS

INT/HOLD

TEST

TRANSDUCERS

R2

FIGURE 2. SIMPLIFIED BLOCK DIAGRAM OF THE HIP9010 IN AN AUTOMOTIVE APPLICATION

20pF

20pF

1M

Pin Descriptions

PIN

NUMBER

SYMBOL

DESCRIPTION

5V power input.

2

GND

This terminal is tied to ground.

This terminal is tied to the internal mid-supply generator and is brought out for supply bypassing by a 0.022

µF

capacitor.

4

INTOUT

Buffered output of the integrator.

5 and 6

NC

These terminals are not internally connected. DO NOT USE.

7

INT/HOLD

Selects whether the chip is in the Integrate Mode (Input High) or in the Hold Mode (Input Low).

8

CS

A low input on this pin enables the chip to communicate over the SPI bus.

9

OSCIN

Input to inverter used for the oscillator circuit. A 4MHz crystal or ceramic resonator is connected between this

pin and pin 10. To bias the inverter, a 1.0M

Ω to 10MΩ resistor is usually connected between this pin and pin 10.

10

OSCOUT

Output of the inverter used for the oscillator. See pin 9 above.

11

MISO

Output of the chip SPI data bus. It is the inversion of the chip DATAIN line. This is an open drain output. The

output must be disabled by placing the CS High when the chip is not selected.

12

MOSI

Input of the chip SPI data bus. Data length is eight bits.

13

SCK

Input from the SPI clock. Normally high, the data is clocked to the chip internal circuitry on the rising clock edge.

14

TEST

A low on this pin places the chip in the test mode. For normal operation this terminal is tied high or left open.

15 and 16

NC

These terminals are not internally connected. DO NOT USE.

17

S1IN

Inverting input to sensor one amplifier. A resistor is tied from this summing input to the transducer. A second

resistor is tied between this terminal and terminal 18, S1FB to establish the gain of the amplifier.

18

S1FB

Output of the sensor one amplifier. This terminal is used to apply feedback.

19

S0FB

Output of the sensor zero amplifier. This terminal is used to apply feedback.

20

S0IN

Inverting input to sensor zero amplifier. A resistor is tied from this summing input to the transducer. A second

resistor is tied between this terminal and terminal 19, S0FB to establish the gain of the amplifier.

HIP9010