TSS400-S1

µPOWER PROGRAMMABLE HIGH-PRECISION

SENSOR SIGNAL PROCESSOR

SLMS001 – D4071, JANUARY 1993

POST OFFICE BOX 655303

4

description (continued)

The TSS400-S1 is designed to meet a wide variety of sensor systems applications including those that require

short time-to-market and rapid and / or frequent programming updates. Since the TSS400-S1 does not require

mask programming, it can be purchased in any quantity. Some typical applications include:

speed, direction, and volume

These sensor systems can be found in many types of applications including home appliances, industrial control

subsystems, HVAC systems and instrumentation, portable instrumentation, consumer products, automotive

products, or anywhere precise ( 12-bit ), ultra-low power ( 12

µA – 15 µA, TYP), intelligent A/D conversion is

essential.

The TSS400-S1 is available in two temperature ranges. The TSS400CFN-S1 is characterized for operation from

0

°C to 70°C. The TSS400AFN-S1 is characterized for operation from –40°C to 125°C.

initialization and power up

Initialization is started by hardware in two ways:

oscillator has started operation. This may take from 1 to 6 seconds.

program execution it is called a warm start ). The CPU starts operation at PC 000 when the INITN pin is

Table 1 lists the TSS400-S1 register contents after a power up or an INITN pin initialization.

Table 1. Register Contents

REGISTER

POWER UP

( COLD START )

INITN PIN

( WARM START )

Program Counter ( PC )

000

000

Status bits POS, NEG, and ZERO

undefined

unchanged

RAM contents †

reset to 0

unchanged

Digit Latches ( DLn )

reset to 0

reset to 0

K-Line’s Latches Contents

undefined

unchanged

Timers

0

unchanged

ADC Voltage SVDD

switched off

switched off

LCD Segment Latches

undefined

unchanged

Subroutine Stack

level 0

level 0

† Despite the RAM remaining unchanged during a warm start, the memory

addressed when INITN is activated may be destroyed by a write cycle.