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ADN2850BCP250 Arkusz danych(PDF) 6 Page - Analog Devices

Numer części ADN2850BCP250
Szczegółowy opis  Nonvolatile Memory, Dual 1024 Position Programmable Resistors
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REV. B
–6–
ADN2850
VSS
GND
V1
V2
PR
WP
VDD
16
ADN2850BCP
CHIP SCALE
PACKAGE
15 14
13
12
11
10
9
8
7
6
5
SDO
4
3
2
1
ADN2850BCP PIN FUNCTION DESCRIPTIONS
Pin
No.
Mnemonic Description
1SDO
Serial Data Output Pin. Open-Drain output
requires external pull-up resistor. CMD_9 and
CMD_10 activate the SDO output. See
Instruction Operation Truth Table (Table II).
Other commands shift out the previously
loaded SDI bit pattern delayed by 24 clock
pulses. This allows daisy-chain operation of
multiple packages.
2GND
Ground Pin, logic ground reference
3VSS
Negative Supply. Connect to zero volts for
single-supply applications.
4V1
Log Output Voltage 1 generated from internal
diode configured transistor
5W1Wiper terminal of RDAC1 ADDR
(RDAC1) = 0H.
6B1B terminal of RDAC1
7B2B terminal of RDAC2
8W2Wiper terminal of RDAC2. ADDR
(RDAC2) = 1H.
9V2
Log Output Voltage 2 generated from internal
diode configured transistor
10
VDD
Positive Power Supply Pin
11
WP
Write Protect Pin. When active low,
WP
prevents any changes to the present register
contents, except
PR and CMD_1 and CMD_8
will refresh the RDAC register from EEMEM.
Execute a NOP instruction before returning
to
WP high.
12
PR
Hardware Override Preset Pin. Refreshes the
scratch pad register with current contents of
the EEMEM register. Factory default loads
midscale 51210 until EEMEM loaded with
a new value by the user (
PR is activated at
the logic high transition).
13
CS
Serial Register chip select active low.
Serial register operation takes place when
CS returns to logic high.
14
RDY
Ready. Active high open-drain output. Identifies
completion of commands 2, 3, 8, 9, 10, and
PR.
15
CLK
Serial Input Register Clock Pin. Shifts in
one bit at a time on positive clock edges.
16
SDI
Serial Data Input Pin. Shifts in one bit at a time
on positive clock CLK edges. MSB loaded first.
TOP VIEW
(Not To Scale)
1
2
3
4
5
6
7
8
SDI
SDO
GND
V1
VSS
W1
ADN2850BRU
CLK
B1
16
15
14
13
12
11
10
9
CS
PR
WP
VDD
V2
W2
B2
RDY
ADN2850BRU PIN FUNCTION DESCRIPTIONS
Pin
No.
Mnemonic Description
1
CLK
Serial Input Register Clock Pin. Shifts in
one bit at a time on positive clock edges.
2
SDI
Serial Data Input Pin. Shifts in one bit at
a time on positive clock CLK edges.
MSB loaded first.
3SDO
Serial Data Output Pin. Open-drain out put
requires external pull-up resistor. CMD_9
and CMD_10 activate the SDO output. See
Instruction Operation Truth Table (Table II).
Other commands shift out the previously
loaded SDI bit pattern delayed by 24 clock
pulses. This allows daisy-chain operation of
multiple packages.
4GND
Ground Pin, logic ground reference
5VSS
Negative Supply. Connect to zero volts for
single-supply applications.
6V1
Log Output Voltage 1 generated from internal
diode configured transistor
7W1Wiper terminal of RDAC1. ADDR
(RDAC1) = 0H.
8B1B terminal of RDAC1
9B2B terminal of RDAC2
10
W2
Wiper terminal of RDAC2. ADDR
(RDAC2) = 1H.
11
V2
Log Output Voltage 2 generated from internal
diode configured transistor
12
VDD
Positive Power Supply Pin
13
WP
Write Protect Pin. When active low,
WP prevents
any changes to the present contents except
PR
and CMD_1 and CMD_8 will refresh the
RDAC register from EEMEM. Execute a NOP
instruction before returning to
WP high.
14
PR
Hardware Override Preset Pin. Refreshes the
scratch pad register with current contents of
the EEMEM register. Factory default loads
midscale 51210 until EEMEM loaded with a
new value by the user (
PR is activated at the
logic high transition).
15
CS
Serial Register chip select active low. Serial
register operation takes place when
CS returns
to logic high.
16
RDY
Ready. Active high open-drain output. Identifies
completion of commands 2, 3, 8, 9, 10, and
PR.
PIN CONFIGURATIONS


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