Analog Integrated Circuit Device Data

Freescale Semiconductor

3

33811

PIN CONNECTIONS

PIN CONNECTIONS

Figure 3. 33811 Pin Connections

1

2

3

4

5

6

16

15

7

8

14

13

12

11

10

9

A_GND

N/C

SOLM1

SOLM2

SOLM3

SOLM4

SOLM5

VPWR

VDD

D_GND

RESET

VSPI

SO

SI

SCLK

CS

Table 1. 33811 Pin Definitions

A functional description of each pin can be found in the Functional Pin Description section beginning on page 11.

Pin Number

Pin Name

Pin Function

Formal Name

Definition

1

VDD

Power

Digital Voltage Supply The VDD pin is the digital logic supply voltage used internally in the IC.

2

D_GND

Ground

Digital Ground

Digital ground for the internal control circuits of the IC. This ground should

be used for decoupling of the VDD supply.

3

SO

Output

Serial Output Data

The SO output pin is used to transmit serial data from the device to the

MCU. The SO pin remains tri-state until selected by the active low CS.

The serial output data is available to be latched by the MCU on the rising

edge of SCLK. The SO data transitions on falling edge of the SCLK.

4

SI

Input

Serial Input Data

The SI input pin is used to receive serial data from the MCU. The serial

input data is latched on the rising edge of SCLK, and the input data

transitions on the falling edge of SCLK.

5

CS

Input

Chip Select

The Chip Select input pin is an active low signal sent by the MCU to

indicate that the device is being addressed. This input requires CMOS

logic levels and has an internal active pull-up current source.

6

SCLK

Input

Serial Clock Input

The SCLK input pin is used to clock in and out the serial data on the SI

and SO pins while being addressed by the CS. The SCLK signal consists

of a 50% duty cycle with CMOS logic levels. Input data is latched by the

device on the rising edge of SCLK while output data is changed on the

falling edge. SCLK is ignored by the device while CS is high.

7

RESET

Input

Reset Input

The RESET pin, when pulled high, clears any fault bits and causes the

Serial Output pin to be tri-stated. The RESET pin operates at the CMOS

levels dictated by the VDD line and the state of the VSPI pin.

8

VSPI

Input

The VSPI pin determines the voltage levels for the SPI interface. It must

be connected to the same voltage supply (+5 volts or +3.3 Volts) as the

MCU’s SPI interface.

9

VPWR

Power

Analog Voltage Supply The analog voltage supply provides the power for all the input amplifiers

and other analog circuitry in the IC.

10

SOLM5

Input

Solenoid Monitor 5

The Solenoid Monitor Input is connected to the solenoid coil at the output

driver. It monitors the current waveform through the solenoid coil as it

appears as a voltage across the output driver MOSFET.

11

SOLM4

Input

Solenoid Monitor 4

The Solenoid Monitor Input is connected to the solenoid coil at the output

driver. It monitors the current waveform through the solenoid coil as it

appears as a voltage across the output driver MOSFET.