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General Purpose Controller / Memory Chip for Hearing Instruments
GP521 - DATA SHEET
FEATURES * general purpose * EEPROM non-volatile memory * 8 programmable current sink (PCS) control outputs * can be configured with 6 PCS outputs for hearing instruments (two switchable, four non-switchable) * status register * data transmission error detection * synchronization of GP521 internal clocks with program unit clock STANDARD PACKAGING * Chip (129 x 112 mils) Au Bump DESCRIPTION The GP521 is a general purpose controller/memory chip intended for use with audio signal path circuits in programmable hearing instruments. The GP521 uses a flexible communication standard which allows room for future growth in programmable functions for hearing instruments. The communication with the program unit is over a bi-directional serial data link. Error detection circuitry is used to avoid undesired changes in programmed settings. The GP521 controls the audio signal path circuit using eight Programmable Current Sinks (PCS). Each PCS has 16 programmable settings. The circuit can be configured for either 6 or 8 PCS outputs. When used with a single pole single throw switch (SPST) under the 6 PCS configuration , it is possible to design a hearing instrument with two programmed settings (i.e. adjusting a low cut filter for either noisy or quiet background environments). The 8 output configuration may be used for circuits that require more programmable but nonswitchable settings. An external reference current is used for the PCS's so that the PCS outputs can track with the currents in the audio signal path circuit. An information transfer dialogue consists of the address and data for a register sent to the GP521 and the register contents returned by the GP521. The function controlled by an output of the GP521 is defined by the signal path circuit allowing current controlled parameters. The relationship between the GP521 register addresses and the function on the signal path circuit is defined by a data file in the programming unit. With this format, any software developed for the GP521 can be used for future generations of Gennum's controller/memory circuits and audio signal path circuits. The GP521 uses EEPROM cells as the long term memory element. These cells will retain the stored data when the power supply is disconnected. Each EEPROM cell is combined with a temporary (RAM) memory cell which makes it possible to evaluate various control settings prior to saving them in the long term EEPROM memory.
BLOCK DIAGRAM
CONTROL OUTPUTS
CONTROL OUTPUTS
IO1
10
IO2
9
IO3
8
IO4
7
IO5
15
IO6
13
IO7
12
IO8
11
4 BIT EEPROM DAC V
CC 3
4 BIT EEPROM DAC
4 BIT EEPROM DAC
4 BIT EEPROM DAC
4 BIT EEPROM DAC
4 BIT EEPROM DAC
4 BIT EEPROM DAC
4 BIT EEPROM DAC REFERENCE CURRENT
17
I
RR
I
GND
5
2
DATA
SERIAL TO PARELLEL CONVERSION DATA ERROR CHECKING CONTROLLER TIMING
EEPROM VOLTAGE MULTIPLIER
STATUS & OPERATION REGISTER
1
CLOCK
OSCILLATOR
16 14
N/C N/C
4
6
SW OFF
OS1
Revision Date: May 1998
Document No. 510 - 79 - 06
GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. +1 (905) 632-2996 Web Site: www.gennum.com E-mail: hipinfo@gennum.com
ABSOLUTE MAXIMUM RATINGS PARAMETER
Supply Voltage Min. voltage any pin Max. voltage any pin Operating temperature
VALUE / UNITS
3 V DC GND - 200 mV VCC + 200 mV 0 to 50 oC
1 CLOCK 2 DATA 3V CC 4 SWOFF 5 GND 6 OS1 7 IO4
IR 17 NC 16 IO5 15 NC 14 IO6 13 IO7 12 IO8 11 IO1 10 IO2 9
GP521
CAUTION
CLASS 1 ESD SENSITIVITY
8
IO3
Fig. 1 Chip Pad Diagram
ELECTRICAL CHARACTERISTICS
Current into IC considered positive.
o Conditions: Temperature = 25 C, IR = 4 A, Vcc = 1.3 V
PARAMETER
Supply Voltage Supply Current:
SYMBOL
VCC I cc
CONDITIONS
MIN.
-
TYP.
1.3 -
MAX
3 25 1 200 50
UNITS
V A mA cycles mV V kHz
Normal operation mode Program mode
1000
EEPROM read / write cycles Low Input Voltage "low" High Input Voltage "high" Clock Rate VL VH CL
VCC - 0.2 -
6
PROGRAMMABLE CURRENT SINKS
Reference current PCS Bias Voltage Number of Settings Output Current for set "15" Linearity Error Output Current offset "0" Output Leakage Current Early Voltage = 1 Channel length modulation VPCS = 0.7V (S9 = b)
All switches remain as shown in Test Circuit unless otherwise stated in condition columns. NOTES: 1. Refer to the definition section 2. Measurements performed for all DAC's separately (SWS 1 to 8 closed sequentially).
IR VPCS
400 N/A
500 16 7.5 10% 0 0
14 N/A 8.25 N/A -
A mV
Io15 IOFFS IL Va
DAC set to 15
VPCS = 0.5 V (note 2)
6.81 N/A -
A
-
DAC set for 1,2,4,8 (note 1, 2) DAC set to 0 (note 1, 2) DAC set to 0 VPCS = 0.5 V (note 1, 2)
nA nA
DAC set to 15 (note 1, 2) Set VPCS = 0.5V and 37 V
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2
1.3 V CLOCK 18 K 1.3 V 18 K
DATA CLOCK OSI SWOFF VCC
+ -
VB = 1.3 V
V REF =0.65V DATA RET
-
27 K
Fig. 2 Digital Test Circuit
GP521 DIGITAL TESTING
The GP521 is tested for digital functionality via a series of reads and writes to the GP521. For a summary of the actual testing refer to Document No. 520-35
8 7
PCS CURRENT (A)
PCS CURRENT (A)
6 5 4 3 2 1
0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
PCS VOLTAGE (V)
Fig. 3 PCS Current (Sink) vs PCS Voltage at DAC Setting 0 to 15, IR = 4A
-
+
-
DATA
+ + +
GND
IR
I R = 4 uA
I 01 I 02
I 03 I 04
I 05
I 06
I 07
I 08
SWS
1
2
3
4
5
6
7
8
A
IO a S9 b
1.3 V 22 K 0.5 V + + 0.7 V
22 K
All resistors in ohms, all capacitors in F unless otherwise stated
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
10 9 8 7 6 5 4 3 2 1 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
7.5 7 6.5 6 5.5 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5
0.8
PCS VOLTAGE(V)
Fig. 4 PCS Current (Sink) vs PCS Voltage IR = 0 to 7.5A (step 0.5A) DAC set at 10
3
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TYPICAL DISTRIBUTION of PCS CURRENT
Number of IC
Number of IC 240
240 200 200 160 160 120 120 80 40 0 -6 -3 0 3 6 80 40 0 -6 -4 -2 0 2 4
Fig. 5 Linearity Error (Digital Input set to 2) [%]
Fig. 6 Linearity Error (Digital Input set to 4) [%]
Number of IC 280 240 200 160 120 80 40 0 -3 -2 -1 0 1 2 3
Fig. 7 Linearity Error (Digital Input set to 8) [%]
Number of IC 280 240 200 160 120 80 40 0 -0.06 -0.03 0 0.0 3 0.06
Number of IC
240 200 160 120 80 40 0
7
7.2
7.4
7.6
7.8
8
8.2
Fig. 8 Output Current Off set [A]
Fig. 9 Output Current for Digital Input set to 15 [A]
* The data was collected on limited numbers of the chips.
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PIN DESCRIPTION CLOCK - The clock pulses for synchronization of the data transfer. The clock pulses are provided by the programming unit. DATA - The input / output pin allow for serial data transfer between the GP521 and the programming unit. VCC - Recommended supply voltage for GP521 is 1.3V Similarly if OS1 is high, IO2 and IO4 are set as high impedance points. This allows PCS IO1 and IO3 to sink current.
TABLE 1 EFFECTS OF SWOFF AND OS1 INPUTS SWOFF OS1 OUTPUT PCS Register Address
0 0
1 0 x x x x x x x x
( IO1 and IO3)* ( IO2 and IO4)* IO1 IO2 IO3 IO4 IO5 IO6 IO7 IO8
(0001000 and 0001010) (0001001 and 0001011) 0001000 0001001 0001010 0001011 0001100 0001101 0001110 0001110
SWOFF - The logic state of SWOFF determines whether the GP521 operates at 6 or 8 PCS configuration. When SWOFF is IO8) PCS are available (8 PCS high, all eight (IO1 to configuration) Figure 10.
1 1 1 1 x
CLOCK DATA V CC SWOFF GND OS1 Io4 Io3
1 2 3 4 5
17 16 15 14
IR NC Io5 NC Io6 Io7 Io8 Io1 Io2
x x x Note*
GP521
13 12
6 7 8
11 10 9
The complementary outputs are set as high impedance points.
Fig.10 EIGHT OUTPUT CONFIGURATION
When SWOFF is low, four PCS (IO5 to IO8) are available; availablility of other two PCS is dependent on the voltage on pin OS1. For this configuration (6 PCS configuration) the necessary hardware connections are presented in Figure 11.
CLOCK DATA VCC SWOFF GND OSI Io4 Io3
1 2 3 4 5
17 16 15 14
IR NC Io5 NC Io6 Io7 Io8 Io1 Io2
IO1 - IO8 - Each pin is the output of the specific Programmable Current Sink (PCS). Each PCS consists of four bit EEPROM memory, Digital to Analog Converter (DAC) and current sink. The EEPROM stores the four bit information written during initialization of the system. Four bit memory allows for 16 settings of the current sink. For simplicity, consider the current sink as a variable resistor. The value of this resistor is dependent on the DAC setting; DAC is controlled by the binary value of the RAM memory. To define output current of the current sink, it is necessary to set the voltage applied to the PCS output. This voltage is recommended to be 0.5 V. If the binary value of the EEPROM increases by one, the value of the output current increases by 0.125 x IR. IR - The reference current delivered from the outside source (eg. GP520A). This current determines the incremental value of the programmable current sink for each increase of the EEPROM address value. The valid addresses run from 0 through to 15. Each step is defined as I = IR x 0.125, therefore maximum current at setting 15 is equal to I15 = IR x 0.125 x 15.
GP521
13 12
6 7 8
11 10 9
Fig. 11 SIX OUTPUT CONFIGURATION
OS1 - The voltage level on this pin determines the selection of four PCS (IO1 to IO4) for 6 PCS configuration. As indicated on Figure 11, pin IO1, IO2 and IO3, I O4 are connected together. If OS1 is low, IO1 and IO3 are set to high impedance. Therefore the PCS, IO2 and IO4 are permitted to sink current.
5
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GP521 REGISTERS There are four types of registers used in the GP521. Their functions are described as follows: ID - Hearing instruments identification register. The contents are set to 0000000 indicating a visual identification is required. STATUS - Monitors the present state of the GP521 and records whether an error has occurred in the previous dialogue with the program unit. The STATUS is read only register. OPERATION - Performs EEPROM read to (write from) RAM operations. The desired operation is specified by the data sent to the register. This is write-only register. PCS - Stores the programmable current sink settings. The register address definitions and the data bit definitions are given in Tables 2 and 3. The STATUS and OPERATION registers are two different registers sharing a common address.
TABLE 2
REGISTER ADDRESS DEFINITIONS
ADDRESS
FUNCTION
TYPE
0000000 0000001 0000010 to 0000111 0001000 0001001 0001010 0001011 0001100 0001101 0001110 0001111 0010000 to 1111111
*
ID STATUS/OP
*
read only read/write
MEMORY CELL *
ROM
RAM / ROM
unused
PCS IO1 PCS IO2 PCS IO3 PCS IO4 PCS IO5 PCS IO6 PCS IO7 PCS IO8 unused
*
read/write read/write read/write read/write read/write read/write read/write read/write
RAM +EEPROM RAM +EEPROM RAM +EEPROM RAM +EEPROM RAM +EEPROM RAM +EEPROM RAM +EEPROM RAM +EEPROM
The GP521 will indicate an error if an unused register is accessed or a write to is attempted to a read-only register.
TABLE 3
DATA BIT DEFINITIONS
DATA BIT 0000000 XXXXXX1
STATUS REGISTER
OPERATION No operation
REGISTER
PCS REGISTER* set IO= 0 set IO= 0.125 IR set IO= 0.25 IR set IO= 0.5 IR
PCS outputs may be different than EEPROM values Load EEPROM values into PCS Save PCS values in EEPROM memory unused
XXXXX1X XXXX1XX XXX1XXX
Circuit busy with EEPROM write Transmission error on previous dialogue Bad Address and/or Operation Error on previous dialogue
unused unused unused unused
set IO= 1.0 IR unused unused unused
XX1XXXX X1XXXXX 1XXXXXX
unused unused unused
*Note: 1. Combining data bits in a word is equivalent to combining the corresponding definitions. (i.e. 0001101 in the PCS register would set the output to IO =1.625 IR ). 2. The upper 3 data bits are ignored except for parity checking.
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ERROR DETECTION The errors detected and recorded in the STATUS register are defined as follows: TRANSMISSION ERROR This error occurs whenever an incoming parity error is detected and/or the GP521 detects that it is not synchronized with the programming unit. This type of error sets a STATUS bit and puts the circuit in unsynchronized mode. The STATUS bit clears after a successful read/write operation. BAD ADDRESS and / or OPERATION ERROR: Status register is set when: - any write operation is attempted while an EEPROM write is in progress - a write operation is attempted on the ID register - any operation is attempted on an unused address. This type of error sets a STATUS bit and sets the parity bit of the returned data stream to the incorrect value. This bit is reset at the conclusion of a acceptable read or write operation. COMMUNICATION FORMAT The dialogue between the programming unit and the GP521 consists of 32 bits being sent to the GP521 which responds by returning 16 bits to the programming unit. A complete dialogue consisting of 48 bits as seen on the DATA line is as follows: From Program Unit: f 1 a6 0 d0 1 d 1 0 d2 1 d 3 0 d4 1 d 5 0 d6 1 p0 0 From GP521: r 0 1 r 1 0 r 2 1 r 3 0 r 4 1 r 5 0 r 6 1 p1 0 The dialogue begins with the bit f and ends with the two bits p1 , 0. The data and synchronization bits must be correct on the falling edge of CLOCK. This relationship is shown in Figure 12. 1 a0 0 a1 1 a2 0 a3 1 a4 0 a5 DATA = 1010 where the final synchronization bit is a low. The next bit following the 4 bit synch code is assumed to be part of a valid dialogue. Once the GP521 is synchronized with the program unit, it is possible to perform a continuous sequence of dialogues without having to re-synchronize unless transmission errors occur. It is also possible to pause and continue the transmission provided the proper relationship between CLOCK and DATA is maintained. To guarantee that the circuit synchronizes properly, the internal shift registers should be cleared by preceding the synch code with a string of bits containing a synch error. An example of the data sequence that guarantees a correctly synchronized circuit is: DATA = 11111010 p1 The alternating 1's and 0's between information bits are used to check whether the GP521 is synchronized with the prgramming unit. The information bits are defined as: f (function bit) f = 0 Write data to specified memory address f = 1 Read data from specified memory address a6a5a4a3a2 a1a0 d6d5d4d3d2 d1d0 pO 7 bit address to read/write to 7 bit data to write to memory parity bit for information from program unit (odd parity) 7 bit data. If f=0, the data will echo the 7 bit data sent by the programming unit. If f=1, the data is read from the memory address. Parity bit for data sent by GP521 (odd parity)
r6r5r4r3r2 r1r0
SYNCHRONIZATION OF THE GP521 WITH PROGRAMMER
The synchronization of the program with the GP521 is done using a code in the data stream which cannot occur during a correct dialogue. The GP521 looks for the following data sequence in the data stream:
CLOCK DATA
f
aO
a1
Synch bit alternates 1 0 1 0 1 ... Fig. 12 7
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DEFINITIONS
LINEARITY ERROR OUTPUT LEAKAGE CURRENT
Linearity error is defined as the difference between the actual current value for a given digital input setting and the current value indicated by the straight line through point P1 and P15. The point P1 is the current at the setting 1 (0001) of the digital input. (Figure 13) The point P15 is the current at the setting 15 (1111) of the digital input (Figure 13) The current at set 0(0000) of the digital input is left out of the linearity error definition. This point on the characteristic is not correlated to other points (there is no current commutation through the current sink at set 0000).
CURRENT VALUE P15
Maximum sink current of the control output at setting 0 of the digital input is defined as output leakage current.
EARLY VOLTAGE
The early voltage is defined by the following equation: V = Early Voltage =
a
1 channel length modulation
=
= where V
a
0.5 -
I0.5 (0.5 - 0.7) (I0.5 - I 0.7)
- Early Voltage
I0.5 - sink output current at bias voltage VPCS = 0.5 V I0.7 - sink output current at bias voltage VPCS = 0.7 V
MEASURED VALUES
LINEARITY ERROR
OUTPUT CURRENT OFFSET
P1
01
2
3
4
5
6
7
8
9 10 11 12 13 14 15
DIGITAL SETTINGS
Fig. 13 PCS Current vs Digital Setting OUTPUT CURRENT OFFSET FOR SETTING 0
The current value determined by the extrapolation of the straight line (defined by the linearity error definition) at setting 0 (0000) of the digital input ( Figure 13) is defined as the ouput current offset.
DOCUMENT IDENTIFICATION: DATA SHEET The product is in production. Gennum reserves the right to make changes at any time to improve reliability, function or design, in order to provide the best product possible. REVISION NOTES:
Updated to Data sheet
Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. (c) Copyright April 1991Gennum Corporation. All rights reserved.
Printed in Canada.
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