uja1023 NXP Semiconductors, uja1023 Datasheet - Page 28

• Manufacturer Part Number: uja1023
• Description: Uja1023 Lin-i/o Slave
• Manufacturer: NXP Semiconductors

Philips Semiconductors
UJA1023_4
Product data sheet
7.2.3.6 ADC mode
This means that the scan matrix value is determined directly after the previous LIN
message.
In case two or more switches are closed simultaneously, extra diodes have to be added to
prevent the ‘short-circuit’ of neighbor switches.
For the switch matrix inputs a ‘quasi’ capture mode can be configured via the data bit
SMC (D3.3) of the second configuration block. If a matrix switch input value has been
changed the changed value is captured until the master reads the switch matrix value via
the UJA1023 command PxResp. Note that two readings are necessary for proper
initialization.
A switch matrix can be configured as local wake-up. If the data bit SMW (D3.2) of the
second configuration block is set to logic 1, a change of a matrix switch input value causes
a wake-up of the UJA1023. If in addition the Switch matrix capture mode is enabled via
SMC the switch matrix value of PxResp represents the local wake-up source switch of the
switch matrix.
The principle of the bit stream ADC is shown in
are needed per analog input, which should be dimensioned as: R
C1 = 10 nF. All eight inputs can be used as analog input, one at a time. ADC values are
referenced to V
of the bit stream. This ratio represents the analog voltage V
to define the measurement period, typically 1.5 ms.
Fig 8. Switch matrix principle
V
V
V
V
th1
th1
th1
th1
VIO
. A register/counter is used to count the ratio of HIGH and LOW phases
R
1 k
R
1 k
R
1 k
R
1 k
on(HS)
on(HS)
on(HS)
on(HS)
Rev. 04 — 5 July 2006
P0
P1
P2
P3
P4
R
50
on(LS)
SM40
SM41
Figure
P5
R
50
on(LS)
9. Only three external components
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
A
. The upper counter is used
P6
R
50
i
on(LS)
= R1 = 100 k ;
UJA1023
LIN-I/O slave
P7
R
50
on(LS)
mdb496
SM72
SM73
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