TSS400-S2

µPOWER PROGRAMMABLE HIGH-PRECISION

SENSOR SIGNAL PROCESSOR

SLMS002 – D4101, OCTOBER 1993

6

POST OFFICE BOX 655303

Done Mode

Timer Active,

Outputs/RAM/

LCD

Stable,

4-

µA Power

Consumption

Typical

Active Mode

With

ADC Active,

300-

µA Power

Consumption

Typical

Active Mode

Without

ADC Active,

80-

µA Power

Consumption

Typical

Off Mode

Outputs/RAM

Stable,

0.1-

µA Power

Consumption

Typical

Power Up or INITN

Command: DONE

INITN or

External Hardware

Wake Up,

Timer Interrupt

Command: OFF

INITN or

External Hardware

Wake up

Figure 1. State Diagram for TSS400-S2 Operational Modes

analog-to-digital converter (ADC) (see Figure 2)

The TSS400-S2 offers a 12-bit ratiometric successive-approximation ADC. Sensors are interfaced to this

converter via the four multiplexed analog inputs ( A1 – A4 ). The analog conversion operation is executed with

the MEASR instruction. The SMPL interpreter automatically switches the internal digit latches DL9, DL10, and

DL11 such that the ADC is connected to the analog input line specified by the MEASR operand. Table 3 lists

the instructions required to access all four analog inputs.

Table 3. Instructions Required to Access Analog Inputs

INSTRUCTION

OPERAND

DL9

DL10

DL11

ACTION

MEASR

0

0

1

0

Connect A1 to the ADC

MEASR

1

0

0

0

Connect A2 to the ADC

MEASR

2

0

1

1

Connect A3 to the ADC

MEASR

3

0

0

1

Connect A4 to the ADC

CHKBATT

X

1

X

X

Check current supply voltage against value in FLAC

ADJBATT

X

1

X

X

Set minimum supply voltage point