Maxon MX7931 Service Manual Product Specification

MX-7930/31/32

MX-7930/31/32 Technical Manual

Section 2 – MX -7930/31/32 Specifications

Issue 1

Contents

Contents..................................................................................................................................1

1. Preface.............................................................................................................................3

1.1 Basic problem..........................................................................................................3

2. The resistor ID ...............................................................................................................3

2.1 The design................................................................................................................3

3. Preface.............................................................................................................................5

4. Accessory interface.....................................................................................................5

5. Signal description.........................................................................................................6

5.1 System connector....................................................................................................6

5.1.1 Signal description..............................................................................................6

5.1.2 Signal levels.......................................................................................................7

6. AX-705/706/707 Travel Charger.................................................................................8

6.1 Temperature ranges................................................................................................8

6.2 Electrical requirements...........................................................................................8

6.2.1 Input frequency..................................................................................................8

6.2.2 Output requirements..........................................................................................8

6.2.3 Output characteristics.......................................................................................8

6.3 Output peak current..............................................................................................10

6.4 System Connector................................................................................................10

6.5 Mechanical details................................................................................................10

7. AX-721 Car charger...................................................................................................11

7.1 Temperature ranges.............................................................................................11

7.2 Weight....................................................................................................................11

7.3 Electrical specification.........................................................................................11

7.3.1 Output requirements........................................................................................11

7.3.2 Input requirements...........................................................................................11

7.3.3 Output current..................................................................................................11

7.4 Output peak current..............................................................................................12

7.5 System Connector................................................................................................12

8. AX-772 Data/fax cable...............................................................................................13

8.1 Block diagram for AX-772...................................................................................13

8.2 ACC_DET :...........................................................................................................13

8.3 Mechanical............................................................................................................14

8.3.1 DB-9 plug.........................................................................................................14

8.3.2 System plug.....................................................................................................14

8.3.3 Cable Data:......................................................................................................14

8.3.4 Electrical Data.................................................................................................15

8.3.5 Phone interface:...............................................................................................15

8.3.6 RS-232 interface:.............................................................................................15

9. AX-773 USB cable. .....................................................................................................16

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9.1 Diagram for AX-773.............................................................................................16

9.2 Electrical interface................................................................................................17

9.2.1 Interface to PC.................................................................................................17

9.3 Summary ................................................................................................................18

9.3.1 Cable delay......................................................................................................18

10. Battery- pack 550mAh ..........................................................................................19

10.1 Electrical specification.........................................................................................19

10.2 Temperature:.........................................................................................................19

10.3 Storage Temperature:..........................................................................................19

10.4 Applicable documents..........................................................................................19

10.5 Protection circuit...................................................................................................20

10.5.1 Feature Description.........................................................................................20

10.5.2 Overcharge Voltage Protection.......................................................................20

10.5.3 Over discharge Voltage Protection..................................................................20

10.5.4 Overcharge Current Protection.......................................................................20

10.5.5 Over discharge Current Protection.................................................................20

10.5.6 Short Circuit Protection...................................................................................20

10.5.7 Current Consumption......................................................................................20

11. Battery- pack 900mAh ..........................................................................................21

11.1 Electrical specification.........................................................................................21

11.2 Temperature:.........................................................................................................21

11.3 Storage Temperature:..........................................................................................21

11.4 Applicable documents..........................................................................................21

11.5 Protection circuit...................................................................................................22

11.5.1 Feature Description.........................................................................................22

11.5.2 Overcharge Voltage Protection.......................................................................22

11.5.3 Over discharge Voltage Protection..................................................................22

11.5.4 Overcharge Current Protection.......................................................................22

11.5.5 Over discharge Current Protection.................................................................22

11.5.6 Short Circuit Protection...................................................................................22

11.5.7 Current Consumption......................................................................................22

12. Portable hands free AX-790................................................................................23

12.1 Earphone...............................................................................................................23

12.2 Microphone............................................................................................................24

13. Terms and abbreviations.....................................................................................26

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1. Preface

The purpose of this section is to define the interface between the MX-7930/31/32 and its
accessories. This is done to keep the number of different id resistors low (for avoiding a
wrong detection of an accessory) and to make it possible to develop new accessories after
the phone is in MP.

1.1 Basic problem

When using only a resistor for id of accessories, the number of different accessories is very
limited and when it is possible to combine different accessories, the number is even lower
(resistors in parallel). When combining the id resistor with a fixed start-up protocol the number
of possible accessories is almost unlimited.

2. The resistor ID

The purpose of the resistor ID is to determine the type of accessory attached to the phone.

2.1 The design

Figure 2-1 shows the design of the RID. The left side of the figure (from V
inside the Sirius with the reference resistor RS. The codec (ADI: AD6521) measures the V
and thereby makes an identification of the device possible. I f connecting two devices to the
SMX-7930/31/32 e.g. AX-772 (Data-fax cable) their different RID becomes parallel. When the
identification of the accessory has finished (measuring of the RID), it is possible to use the line
as an ordinary I/O. The equations below Figure 2-1 are used for the calculations of the
system. Notice that equation (2) only is valid for 10-bit ADC.

V

REF

) is the circuit

ADC

ADC

AD6521

S

R

10bit ADC

AD6522

I/O

Device 1

Figure 2-1: The RID design.

R

(1)

(2)

VV+=

REFADC

ID

RR

SID

V

2reading ADC

REF10

V

ADC,MAX

V

ADC

ID

ID

R

R

Device 2

R

ID

⋅⋅=

RR

+

SID

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Table 2-1 shows the chosen RID and its possible co mbinations for MX-7930/31/32
accessories. The corresponding ADC value is calculated from equation (2) with a ±4%
tolerance. To decode the accessory category refer to Table 2-2.

RID

Accessor
y

68 kΩ A

22 kΩ B

13 kΩ C

47 kΩ D

82 kΩ E

Table 2-1: RID tabel for MX-7930/31/32.
Note: * This is not an error. The V

V

are proportional! Refer to equation (1) and (2).

ADC

Accessory
category

Description Device

A USB cable AX-771

Datafax cable (DTR

B
C
D

LOW)
Datafax cable (DTR
HIGH)
Gernie cable

E Car-kit AX-791

Table 2-2: Accessory category.

VADC [mV] ADC readings
Min Typ Max Min Typ. Max

1,54
4 V
0,81
5 V
0,54
3 V
1,29
6 V
1,66
6 V

1,59
5 V
0,84
6 V
0,57
1 V
1,34
1 V
1,71
9 V

1,640 V 129

0 1306 1321
0,875
V 681 693 705
0,586
V 453 468 472
1,382 V 108

3 1099 1113
1,766 V 139

2

inside the code will compensate this value. V

ADC

Number

AX-770

1408 1422 30

Description
For debugging of phone

Data fax cable

AX770

None

Debug cable

Car-kit

Typ. span
down

31

24

19

30

REF

and

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3. Preface

The purpose of this section is to give an overview of the signals on the system connector of
the MX-7930/31/32 wh en the phone is used with various accessories. For a full description of
the signals, refer to the documents of each of the devices. The signal type is oriented from the
phone e.g. when a signal is type ‘I’ (I nput) the signal is an input to the phone and therefore an
output of the device.

4. Accessory interface

Figure 4-1 is an illustration of the system connector mounted in the phone. The numbers on
the drawing shows the pin numbering of the connector.
Table 4-1 gives an overview of the signal names that appears on the system co nnector when
combining the phone with an acce ssory.

10 8 7 345 126922 20 19 11151617 1213141821

Figure 4-1: The system connector insight the phone.

Table 4-1: Accessory interface

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5. Signal description

This section lists the signal names that appear on the system connector with a short
description. The signal description is oriented from the phone e.g. when a signal is type ‘I’
(Input) the signal is an input to the phone and therefore an output of the device.

Type Description

AI Analog input
GND Ground
INQE Edge trigged interrupt
INQL Level trigged interrupt
I Digital input
NC Not connected
O Digital output
S Power supply

Table 5-1: Description of signal names.

5.1 System connector

5.1.1 Signal description

Pin
#

1-2 GND GND Ground Power ground
5 USC0 I/O Ordinary input/output pin.
7 USC1 I/O Ordinary input/output pin.
10 USC2 I/O Ordinary input/output pin. 100kΩ pull-up to V

8 USC3 I/O Ordinary input/output pin.

9 USC4 I/O Ordinary input/output pin.
6 USC5 I/O
11 USC6 I/O/INQL

13 EXTIFEN S

12 ACC_DET I/O/AI/IRQL

3-4 V_EXT S/IRQL Input from extern charger. IRQ trough the PMU
14 JTAG0
15 JTAG1
16 JTAG2
17 JTAG3
18 JTAG5

21
20 GSPB-TX

19 GSPB-RX
22 GND GND Ground Power ground

Table 5-2: Signal description for the system connector.

Signal Type Description Special Notes

Also connected to
GPIO_7
Also connected to

GPIO_00
Ordinary input/output pin.
Ordinary input/output pin and level trigged
interrupt.
Used for power of external device. Power
level is equal VPA.
AI is used for accessory detection. When Id
of the accessory has been performed it is
possible to use this pin as ordinary I/O.

49.9kO pull-up to

V

IRQ is software

DIG_IF.

supported (GSP

\SYS_RESET/
VPP

db_DO/DI

DIG_IF

)

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5.1.2 Signal levels

Figure 5-1 shows the signal levels for the AD6522. The load for all pins is max 8mA except for
GPIO_3 and GPIO_7 with only support 4mA source and ½mA sink. The USC2 is an open
collector and a 100kΩ pull-up resi stor has been added. If the load on the pin is below 2mA it is
possible to provided a minimum digital output (high) on 2.5V

V

CC,MIN

+0.3=3.00V

AD6522

HIGH

HIGH

V

EXT,MAX

EXT,MIN

USC2

0.7·V

CC,MAX

CC,MIN

=1.75V

=0.72V0.3·V

LOW

Digital
Inputs

LOW

Digital

Outputs

EXT,MIN

0.2V

Figure 5-1: Signal levels for AD6522.

=2.82VV

-0.2=2.50V

-8mA·100kΩ=1.90VV

V

EXT,MAX

V

EXT,TYP

V

EXT,MIN

V

CC,MAX

V

CC,TYP

V

CC,MIN

= 2.82 V
= 2.76 V
= 2.70 V

= 2.50 V
= 2.45 V
= 2.40 V

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Output Voltage [V]

6. AX-705/706/707 Travel Charger.

6.1 Temperature ranges.

Operating temperature range is –0 to +35°C, where the charger fulfils all specifications.
In the temperature ranges –25 to -0 and +35 to 50°C the charger can be operated for a short

period. It doesn’t need to fulfil all specifications in previous mentioned temperature ranges.
Storage temperature range for the charger is –40 +85 °C.

6.2 Electrical requirements

The charger need to fulfil all minimum requirements in the temperature range for operation: 0
to +35 C.
The output current and voltage shall be measurement in Average, and shall comply with the
specifications in this paragraph.

6.2.1 Input frequ ency

Operating input frequency range is 47 - 63Hz.

6.2.2 Output requirements

Symbol Parameter Test

Min Type Max Unit

conditions

I Out Output current V out 2,5-5V 350 450 500 mA
V Out Output voltage No load 5,5 6,5 6,8 V
Temp Operating temperature

range
Ripple Output - - 200 mVp-p
Frequency Output - - 150 KHZ

Ipeak

Output peak

current

0 - +35 °C

- - 2 A

6.2.3 Output characteristics

Output caracteristics

8
7
6
5
4
3

Max
Min

2
1
0

0 200 400 600 800 1000

Output current [mA]

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