TPM754A [NXP]

Microcontroller with TrackPoint microcode from IBM; 微控制器与IBM的指点杆微


型号：	TPM754A
厂家：	NXP
描述：	Microcontroller with TrackPoint microcode from IBM 微控制器与IBM的指点杆微微控制器
文件：	总12页 (文件大小：85K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

INTEGRATED CIRCUITS

TPM754A

Microcontroller with TrackPoint

microcode from IBM

Preliminary specification

1999 Nov 11

Replaces datasheet TPM754 of 1997 Dec 03

IC28 Data Handbook

Philips

Semiconductors

Philips Semiconductors

Preliminary specification

Microcontroller with TrackPoint microcode from IBM

TPM754A

The Philips Semiconductors TPM754 is a small package, low cost,

ROM-coded 80C51 with IBM ’s TrackPoint pointing algorithms

and control code. TrackPoint is the result of years of human factors

PIN CONFIGURATION

RxD/T0/P3.4

TxD/T1/P3.5

ECI/P3.6

INT1/P3.7

RST

28 P3.3

research and innovation at IBM. The result is a “velocity sensitive”

pointing solution more efficient and easier to use than “position

sensitive” devices such as the mouse, the trackball, or the touchpad.

27 P3.2

26 P3.1

IBM has licensed Philips Semiconductors to sell microcontrollers

with TrackPoint code. By purchasing a TPM from Philips, the

purchaser becomes a sub-licensee of Philips. The selling price of

Philips’ TPM includes the royalties for IBM’s intellectual property,

which Philips in turn pays to IBM. Customers for TPMs do not need

to sign any licensing agreement with either IBM or Philips. This code

is the intellectual property of IBM, which is covered by numerous

patents, and must be treated accordingly.

25 P3.0

24 INT0/P1.0

23 CEX/P1.1

PLASTIC

SHRINK

SMALL

OUTLINE

PACKAGE

22 V

21 P1.2

ZIN

20 XYDAC

YIN 10

XIN 11

19 ZDAC/ASEL

18 XYSOURCE

17 XYDACBIAS

16 VREG

The TPM754 contains IBM TrackPoint code, a single module

PCA, a 256 × 8 RAM, 21 I/O lines, two 16-bit counter/timers, a

two-priority level interrupt structure, a full duplex serial channel, an

on-chip oscillator, and an 8-bit D/A converter.

XYZRAMP 12

For identical device without TrackPoint code, see the 8XC754

datasheet.

15 DECOUPLE

SU00726B

FEATURES

• 80C51-based architecture

• Small package sizes – 28-pin SSOP

• Power control modes:

– Idle mode

– Power-down mode

• 256 × 8 RAM

• Two 16-bit auto reloadable counter/timers

• Single module PCA counter/timer

• Full duplex serial channel

• Boolean processor

• CMOS and TTL compatible

ORDERING INFORMATION

TEMPERATURE RANGE °C

DRAWING

NUMBER

ORDERING CODE

FREQUENCY

AND PACKAGE

PTPM754A DB

0 to +70, 28-pin Shrink Small Outline Package

3.5 to 12 MHz

SOT341-1

NOTE:

1. PTPM754A has improved start-up from low-voltage power down.

IBM is a registered trademark, and TrackPoint is a trademark of IBM Corporation.

1999 Nov 11

Philips Semiconductors

Preliminary specification

Microcontroller with TrackPoint microcode from IBM

TPM754A

PIN DESCRIPTION

MNEMONIC

DIP

PIN NO.

TYPE

NAME AND FUNCTION

Circuit Ground Potential.

Supply voltage during normal, idle, and power-down operation.

P1.0–P1.2

21, 23, 24

I/O

Port 1: Port 1 is a 3-bit bidirectional I/O port with internal pull-ups on P1.0 and P1.1. Port 1 pins that

have 1s written to them can be used as inputs. As inputs, port 1 pins that are externally pulled low will

source current because of the internal pull-ups (P1.0, P1.1). (See DC Electrical Characteristics: I ).

Port 1 also serves the special function features listed below (Note: P1.0 does not have the strong

pullup that is on for 2 oscillator periods.):

INT0 (P1.0): External interrupt 0.

CEX (P1.1): PCA clock output.

P3.0–P3.7

1–4,

25–28

I/O

Port 3: Port 3 is an 8-bit bidirectional I/O port with internal pull-ups. Port 3 pins that have 1s written to

them are pulled high by the internal pull-ups and can be used as inputs. As inputs, port 3 pins that are

externally being pulled low will source current because of the pull-ups. (See DC Electrical

Characteristics: I ). (Note: P3.5 does not have the strong pullup that is on for 2 oscillator periods.)

Port 3 also serves the special function as listed below:

ECI (P3.6): External PCA clock input.

RxD/T0 (P3.4): Serial port receiver data input.

Timer 0 external clock input.

INT1: External interrupt 1.

TxD/T1 (P3.5): Serial port transmitter data.

Timer 1 external clock input.

RST

Reset: A high on this pin for two machine cycles while the oscillator is running resets the device.

(NOTE: The TPM754 does not have an internal reset resistor.)

Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator circuits.

Crystal 2: Output from the inverting oscillator amplifier.

Analog supply voltage and reference input.

Analog supply and reference ground.

ZIN

YIN

XIN

ZIN: Input to analog multiplexer.

YIN: Input to analog multiplexer.

XIN: Input to analog multiplexer.

XYZRAMP

DECOUPLE

VREG

XYZRAMP: Provides a low impedance pulldown to V under S/W control.

DECOUPLE: Output from regulated supply for connection of decoupling capacitors.

VREG: Provides regulated analog supply output.

XYDACBIAS

XYSOURCE

ZDAC

XYDACBIAS: Provides source voltage for bias of external circuitry.

XYSOURCE: Provides source voltage from regulated analog supply.

ZDAC: Switchable output from the internal DAC.

XYDAC

XYDAC: Non-switchable output from the internal DAC.

NOTE:

1. AV (reference ground) must be connected to 0 V (ground). AV (reference input) cannot differ from V by more than ±0.2 V, and must

be in the range 4.5 V to 5.5 V.

1999 Nov 11

Philips Semiconductors

Preliminary specification

Microcontroller with TrackPoint microcode from IBM

TPM754A

The DAC is an 8-bit device and its output appears on the XYDAC

pin. In addition, the DAC output may also be routed to the ZDAC pin

by means of bit AC6 in the ACON0 register. The DAC output is not

buffered, so external load impedances should be taken into

consideration when using either of these outputs.

OSCILLATOR CHARACTERISTICS

X1 and X2 are the input and output, respectively, of an inverting

amplifier which can be configured for use as an on-chip oscillator.

To drive the device from an external clock source, X1 should be

driven while X2 is left unconnected. There are no requirements on

the duty cycle of the external clock signal, because the input to the

internal clock circuitry is through a divide-by-two flip-flop. However,

minimum and maximum high and low times specified in the data

sheet must be observed.

A 3-input multiplexer is provided, whose output is connected to the

positive reference of a comparator. The multiplexer output is

controlled by bits MUX2:0 of ACON1. A bandgap reference supplies

the negative reference of the comparator. The output of the

comparator may be used the trigger the capture input of module 4 of

the PCA.

IDLE MODE

A low impedance pulldown is supplied at the XYZRAMP pin and is

controlled by bit AC5 of ACON0.

The TPM754 includes the 80C51 power-down and idle mode

features. In idle mode, the CPU puts itself to sleep while all of the

on-chip peripherals except the D/A stays active. The functions that

continue to run while in the idle mode are the timers and the

interrupts. The instruction to invoke the idle mode is the last

instruction executed in the normal operating mode before the idle

mode is activated. The CPU contents, the on-chip RAM, and all of

the special function registers remain intact during this mode. The

idle mode can be terminated either by any enabled interrupt (at

which time the process is picked up at the interrupt service routine

and continued), or by a hardware reset which starts the processor in

the same manner as a power-on reset. Upon powering-up the

circuit, or exiting from idle mode, sufficient time must be allowed for

stabilization of the internal analog reference voltages before a D/A

conversion is started.

The functions of the analog section are controlled by the IBM

TrackPoint code embedded within the Philips TPM754.

PC BOARD LAYOUT CONSIDERATIONS

The TrackPoint is a low-level analog circuit. While not difficult to

implement, careful consideration should be given to circuit board

layout to obtain proper operation of the TrackPoint. The

considerations are similar to that used for radio frequency

application. The circuit should be located far from the CPU and

video lines, and should also be shielded from any digital signals. A

100µV pulse picked up every 3 or 4 seconds is sufficient to cause

cursor drift. A good circuit board layout will result in a circuit that is

very stable and will hold the cursor on a pixel for days at a time.

However, the autorouters of most software board layout packages

will not do an adequate job, and manual routing of this portion of the

motherboard is recommended.

I/O Ports

The I/O pins provided by the TPM754 consist of port 1 and port 3.

Port 1

Port 1 is a 3-bit bidirectional I/O port and includes alternate functions

on some pins of this port. Pins P1.0 and P1.1 are provided with

internal pullups while the remaining pin (P1.2) has an open drain

output structure. The alternate functions for port 1 are:

The TPM754 has excellent supply regulation for the analog portions

of the TrackPoint circuit. However, care should be taken with respect

to the circuit ground to avoid voltage shifts due to non-TrackPoint

loads. The analog part of the circuit must have its own ground

plane, isolated from everything else and connected to the main

ground at just one point (no ground loops). All of the analog portion

of the TrackPoint circuit, and nothing else, must be over this

ground island.

INT0 – External interrupt 0.

CEX – PCA clock output.

Port 3

Port 3 is an 8-bit bidirectional I/O port structure.

No digital traces can pass though the analog area on any level from

the ground plane out. The circuit should be confined to one side of

the ground plane, preferably on the first interior layer, with the

ground plane next. The circuit should be powered only at a single

point (pin 14), and that power should be filtered to ground before it

comes onto the analog area.

The alternate functions for port 3 are:

RxD – Serial port receiver data input.

T1 – Timer 1 external clock input.

INT1 – External interrupt 1.

TxD – Serial port transmitter data.

T0 – Timer 0 external clock input.

ECI – PCA external clock input.

The signal lines from the TrackPoint sensor stick can be sensitive to

pickup, and should be run close together, and not too close to digital

lines. A grounded guard trace is a good idea. Most important, the

stick common line is not a ground line, but rather a signal line,

although it will eventually connect to the analog ground. A common

and serious error is to treat it as ground, connecting it to a general

ground at some convenient point.

Analog Section

The analog section of the TPM754, shown in Figure 1, consists of

four major elements: a bandgap referenced voltage regulator, an

8-bit DAC, an input multiplexer and comparator, and a low

impedance pulldown device.

The layout should be designed to keep things compact and minimize

trace lengths. The whole circuit, analog and digital, will fit

comfortably within 2cm × 3cm. In some situations, it may be

desirable to put the circuit on a separate card instead of on the

motherboard. In this case, a shielded cable should provide the best

means of connecting the stick signals to the circuit card.

The bandgap voltage regulator uses the AV pin as its supply and

produces a regulated output on the VREG pin. The regulator also

supplies the analog supply voltage for the DAC. The regulator may

be switched on/off by means of the AC1 bit in the analog control

XYDACBIAS and XYSOURCE pins by means of bits AC3 and AC4,

respectively. The DECOUPLE pin is provided for decoupling the

regulator output.

1999 Nov 11

Philips Semiconductors

Preliminary specification

Microcontroller with TrackPoint microcode from IBM

TPM754A

BANDGAP REF*

AC1

DECOUPLE

VREG

AC2

AC3

20K

10K

XYDACBIAS

AC4

XYSOURCE

XYDAC

DCON 7:0 (84H)

AC6

ZDAC

ZIN

YIN

XIN

AC7

ANALOG

MUX

TO PCA TRIGGER

BANDGAP REF

EXT

MUX0

MUX1

MUX2

XYZRAMP

AC5

*ENABLED/DISABLED BY AC0

SU00765A

Figure 1. Analog Section

ALTERNATE

OUTPUT

FUNCTION

READ

LATCH

INTERNAL*

PULL-UP

INT. BUS

LATCH

WRITE TO

LATCH

READ

ALTERNATE INPUT

FUNCTION

*PINS LISTED AS OPEN DRAIN WILL NOT HAVE THIS PULLUP

SU00671

Figure 2. Typical Port Bit Latches and I/O Buffers

1999 Nov 11

Philips Semiconductors

Preliminary specification

Microcontroller with TrackPoint microcode from IBM

TPM754A

1, 3, 4

ABSOLUTE MAXIMUM RATINGS

PARAMETER

Storage temperature range

Voltage from V to V

RATING

UNIT

°C

–65 to +150

–0.5 to +6.5

Voltage from any pin to V

Power dissipation

–0.5 to V + 0.5

1.0

DC ELECTRICAL CHARACTERISTICS

amb

= 0°C to +70°C, AV = 5 V ±5, AV = 0 V

CC SS

= 5 V ± 10%, V = 0 V

LIMITS

SYMBOL

PARAMETER

TEST CONDITIONS

UNIT

MAX

MIN

TYP

Supply current (see Figure 5)

Inputs

Input low voltage, port 1, 3

Input high voltage, port 1, 3

Input high voltage, X1, RST

–0.5

0.2V –0.1

0.2V +0.9

+0.5

0.7V

IH1

Outputs

Output low voltage, port 3, 1.2

Output low voltage, port 1.0, 1.1

Output high voltage, ports 3, 1.0, 1.1

Input leakage current, port 1, 3, RST

Pin capacitance

= 1.6 mA

= 3.2 mA

0.45

OL1

= –60 µA,

2.4

0.45 < V < V

±10

µA

Test freq = 1 MHz,

= 25°C

amb

NOTES:

1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and

functional operation of the device at these or any conditions other than those described in the AC and DC Electrical Characteristics section

of this specification is not implied.

2. Under steady state (non-transient) conditions, IOL must be externally limited as follows:

Maximum I per port pin:

10mA

26mA

67mA

Maximum I per 8-bit port:

Maximum total I for all outputs:

If I exceeds the test condition, V may exceed the related specification. Pins are not guaranteed to sink current greater than the listed

test conditions.

3. This product includes circuitry specifically designed for the protection of its internal devices from the damaging effects of excessive static

charge. Nonetheless, it is suggested that conventional precautions be taken to avoid applying greater than the rated maxima.

4. Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to V unless otherwise

noted.

5. Power-down I is measured with all output pins disconnected; X2, X1 n.c.; RST = V

6. I is measured with all output pins disconnected; X1 driven with t

, t

= 5 ns, V = V + 0.5 V, V = V – 0.5 V; X2 n.c.;

CLCH CHCL IL SS IH CC

RST = V . I will be slightly higher if a crystal oscillator is used.

CC CC

7. Idle I is measured with all output pins disconnected; X1 driven with t

, t

= 5 ns, V = V + 0.5 V, V = V – 0.5 V; X2 n.c.;

CLCH CHCL IL SS IH CC

RST = V

8. Pin 9, 10, 11, and 21; V ≤ V

REG

1999 Nov 11

Philips Semiconductors

Preliminary specification

Microcontroller with TrackPoint microcode from IBM

TPM754A

ANALOG SECTION ELECTRICAL CHARACTERISTICS

amb

= 0°C to +70°C;

= 5 V ± 10%, V = 0 V

LIMITS

SYMBOL

PARAMETER

TEST CONDITIONS

UNIT

MAX

MIN

TYP

Analog Inputs

Analog supply voltage

Sensor resistor

4.5

330

–

5.5

2.5

Ω

IAV

AC0 = 0 IC only

AC0 = 1

1.2

–

µA

–

Regulator

VREG

IVREG = 13 mA

3.6

–

3.8

4.3

100

–

µF

Ω

ICHARGE

CDECOUPLE

RDSONQ1

ILEAKAGEQ1

ILEAKAGEQ2

PSRR

Decouple current

= 10 µF

DEC

Stability requirement

–

–10

–

+10

–

µA

100 Hz

–40

MUX and Comparator

Comparator trip point

MUX impedance

≤ V

1.14

–

1.26

1.38

kΩ

µA

ILEAKAGEMUX

Digital-to-Analog Conversion

ZDAC, XYDAC monotonicity

–10

+10

REG

–

bits

Ω

ZDAC switch impedance

DAC output resistance

ZDAC switch leakage

2.7

200

–

kΩ

µA

–10

+10

Switches

XYZRAMP impedance

XYZRAMP leakage

–

–10

–

100

+10

Ω

µA

Ω

XYDACBIAS impedance

XYDACBIAS leakage

XYSOURCE impedance

XYSOURCE leakage

–10

–

+10

400

+70

µA

Ω

200

–10

µA

AC ELECTRICAL CHARACTERISTICS

amb

= 0°C to +70°C, V

= 5 V ±10%, V = 0 V

VARIABLE CLOCK

SYMBOL

1/t

PARAMETER

MIN

MAX

UNIT

Oscillator frequency:

External Clock (Figure 3)

3.5

MHz

CLCL

High time

Low time

Rise time

Fall time

CHCX

CLCX

CLCH

CHCL

1999 Nov 11

Philips Semiconductors

Preliminary specification

Microcontroller with TrackPoint microcode from IBM

TPM754A

EXPLANATION OF THE AC SYMBOLS

Each timing symbol has five characters. The first character is always

‘t’ (= time). The other characters, depending on their positions,

indicate the name of a signal or the logical status of that signal.

The designations are:

C – Clock

D – Input data

H – Logic level high

L – Logic level low

Q – Output data

T – Time

V – Valid

X – No longer a valid logic level

Z – Float

–0.5

CLCX

0.2 V + 0.9

0.2 V – 0.1

0.45V

CHCX

CLCH

CHCL

CLCL

SU00297

Figure 3. External Clock Drive

–0.5

0.2 V + 0.9

0.2 V – 0.1

0.45V

SU00307

Figure 4. AC Testing Input/Output

MAX ACTIVE I

TYP ACTIVE I

MAX IDLE I

TYP IDLE I

4MHz

8MHz

12MHz

FREQ

SU00739

Figure 5. I vs. FREQ

Maximum I values taken at V = 5.5V and worst case temperature.

Typical I values taken at V = 5.0V and 25°C.

Notes 6 and 7 refer to AC Electrical Characteristics.

1999 Nov 11

2.2uF

0.1uF

10uF

FORCE SENSOR

AVCC

VCC

100K

TPM754

JMP2

DEC

RST

SEE NOTE 10

SEE NOTE 8

JMP3

R16

R15

INVERT Y

INVERT Z

VREG

XYDB

P3.6

P3.3

SEE NOTE 10

SEE NOTE 9

CN1

TACTILE

TO SYSTEM BOARD

4.7K

P1.1

XYS

WIN

ZIN

YIN

XIN

GND

COM

VCC

CLK

Z or +

INT0

TXD/T1

DATA

0.01uF

LMC6036

INT1

RXD/T0

RMP

0.01uF

XYD

ZDAC

R23

R24

12.0MHz

MID 27

MOUSE

R10

10K

R14

10K

–X

P3.1

P3.2

P3.0

AVSS

LMC6036

6 PIN MINI DIN

–Y

CLK

DATA

0.01uF

VSS

R11

COMMON

R18

JMP1

SEE NOTE 3

TACTILE FEEDBACK OUTPUT

STICK WIRING MAY VARY

LMC6036

TYPICAL WIRING SHOWN FOR

REFERENCE ONLY

BUTTONS

BUTTON ASSEMBLY

COM

RIGHT

LEFT

R17

RIGHT

0.01uF

10% OR BETTER

TEMPERATURE STABLE

MIDDLE

LEFT

MIDDLE

NOTES:

1. All resistors 1% low noise unless noted.

2. Middle button switch is optional.

3. Jumper JMP1 is only installed when middle button is not present, otherwise it is not populated.

4. Connectors are shown for reference only.

5. Connection between analog and digital ground must be a single point connection close to the TPM754.

6. Component values that are not specified depend upon stick sensitivity, geometry, impedance, and tolerance.

7. TPM754 Reset pin (Pin 5) can be driven by system power on reset signal (active High). Omit C4, R 8 in this case.

8. If Pin 3 is grounded, positive voltage swing on the stick’s Y terminal will move the cursor downward (–Y), otherwise upward.

9. If Pin 28 is grounded, positive voltage swing on the stick’s terminal will be interpreted as downward (–Z) force, otherwise upward.

10. A Z axis series resistor and a fifth stick terminal may be present.

11. For most current information, see www.ibm.com.

TYPCIAL TARGET SETTINGS

50 counts per Z DAC step

18 counts per XY DAC step

3.2 grams/count XY

10 grams/count Z

Philips Semiconductors

Preliminary specification

Microcontroller with TrackPoint microcode from IBM

TPM754A

SSOP28: plastic shrink small outline package; 28 leads; body width 5.3mm

SOT341-1

1999 Nov 11

Philips Semiconductors

Preliminary specification

Microcontroller with TrackPoint microcode from IBM

TPM754A

NOTES

1999 Nov 11

Philips Semiconductors

Preliminary specification

Microcontroller with TrackPoint microcode from IBM

TPM754A

Data sheet status

[1]

Data sheet

status

Product

status

Definition

Objective

specification

Development

This data sheet contains the design target or goal specifications for product development.

Specification may change in any manner without notice.

Preliminary

specification

Qualification

This data sheet contains preliminary data, and supplementary data will be published at a later date.

Philips Semiconductors reserves the right to make changes at any time without notice in order to

improve design and supply the best possible product.

Product

specification

Production

This data sheet contains final specifications. Philips Semiconductors reserves the right to make

changes at any time without notice in order to improve design and supply the best possible product.

[1] Please consult the most recently issued datasheet before initiating or completing a design.

Definitions

Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For

detailed information see the relevant data sheet or data handbook.

Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one

or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or

at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended

periods may affect device reliability.

Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips

Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or

modification.

Disclaimers

Life support — These products are not designed for use in life support appliances, devices or systems where malfunction of these products can

reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications

do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application.

Righttomakechanges—PhilipsSemiconductorsreservestherighttomakechanges, withoutnotice, intheproducts, includingcircuits,standard

cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no

responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these

products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless

otherwise specified.

Philips Semiconductors

811 East Arques Avenue

P.O. Box 3409

Sunnyvale, California 94088–3409

Telephone 800-234-7381

Date of release: 11-99

Document order number:

9397 750 06577

Philips

Semiconductors

1999 Nov 11

TPM754A [NXP]

相关型号：

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TPMBU120-108

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TPMBU150