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GP521 データシート(PDF) 5 Page - Gennum Corporation

部品番号 GP521
部品情報  General Purpose Controller / Memory Chip for Hearing Instruments
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メーカー  GENNUM [Gennum Corporation]
ホームページ  http://www.gennum.com
Logo GENNUM - Gennum Corporation

GP521 データシート(HTML) 5 Page - Gennum Corporation

  GP521 Datasheet HTML 1Page - Gennum Corporation GP521 Datasheet HTML 2Page - Gennum Corporation GP521 Datasheet HTML 3Page - Gennum Corporation GP521 Datasheet HTML 4Page - Gennum Corporation GP521 Datasheet HTML 5Page - Gennum Corporation GP521 Datasheet HTML 6Page - Gennum Corporation GP521 Datasheet HTML 7Page - Gennum Corporation GP521 Datasheet HTML 8Page - Gennum Corporation  
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Similarly if OS1 is high,
I
O2 and IO4 are set as high impedance
points. This allows PCS
I
O1 and IO3 to sink current.
I
O1 - 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
I
R
.
I
R
- 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 = I
R
x 0.125,
therefore maximum current at setting 15 is equal to
I
15
=
I
R
x
0.125 x 15.
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.
V
CC
- Recommended supply voltage for GP521 is 1.3V
SWOFF - The logic state of SWOFF determines whether the
GP521 operates at 6 or 8 PCS configuration. When SWOFF is
high, all eight (
I
O1
to
I
O8
) PCS are available
(8 PCS
configuration) Figure 10.
PIN DESCRIPTION
GP521
CLOCK
DATA
V
CC
GND
OS1
SWOFF
I
o4
I
o3
I
o5
NC
I
o6
I
o7
I
o1
I
o8
I
o2
I
R
NC
Fig.10 EIGHT OUTPUT CONFIGURATION
When SWOFF is low, four PCS (I
O5
to I
O8
) 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.
DATA
V
CC
GND
I
R
NC
OSI
GP521
I
o4
I
o3
I
o5
NC
I
o6
I
o7
I
o1
I
o8
I
o2
SWOFF
Fig. 11 SIX OUTPUT CONFIGURATION
CLOCK
OS1 - The voltage level on this pin determines the selection
of four PCS (
I
O1 to IO4) for 6 PCS configuration.
As indicated
on Figure 11, pin
I
O1, IO2 and IO3, IO4 are connected together.
If OS1 is low,
I
O1 and IO3 are set to high impedance.
Therefore
the PCS,
I
O2 and IO4 are permitted to sink current.
TABLE 1 EFFECTS OF SWOFF AND OS1 INPUTS
SWOFF OS1
OUTPUT
PCS Register Address
0
1
( I
O1
and I
O3
)*
(0001000 and 0001010)
0
0
( I
O2
and I
O4
)*
(0001001 and 0001011)
1x
I
O1
0001000
1x
I
O2
0001001
1x
I
O3
0001010
1x
I
O4
0001011
xx
I
O5
0001100
xx
I
O6
0001101
xx
I
O7
0001110
xx
I
O8
0001110
Note*
The complementary outputs are set as high
impedance points.


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