uja1023 NXP Semiconductors, uja1023 Datasheet - Page 5

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

Philips Semiconductors
UJA1023_4
Product data sheet
7.2.1.1 Message sequence
7.1.3 Automatic bit rate detection
7.1.4 Oscillator
7.1.5 I/O block
7.1.6 ADC
7.1.7 PWM
7.1.8 Cyclic sense
7.2.1 Configuration
7.2 LIN controller
electromagnetic emission. The required LIN slave termination of 30 k is already
integrated. In case of LIN bus faults the UJA1023 switches to the low-power Limp home
mode.
The automatic bit rate detection adapts to the LIN master’s bit rate. Any bit rate between
1 kbit/s and 20 kbit/s can be handled. This block checks whether the synchronization
break and synchronization field are valid. If not, the message will be rejected.
The on-chip oscillator provides the internal clock signal for some digital functions and is
the time reference for the automatic bit rate detection.
The I/O block controls the configuration of the I/O pins. The LIN master configures the I/O
pin functionality by means of a master request frame and an optional slave response
frame.
Besides the standard level input and output behavior the following functions are also
handled by the UJA1023: local wake-up, cyclic input, edge capture, PWM output, switch
matrix I/O and AD conversion.
With three external components an 8-bit ADC function can be implemented. Each of the
eight bidirectional I/O pins can be used as input for the ADC, one at a time.
Each pin can be configured with a Pulse Width Modulation (PWM) function. The resolution
is 8-bit and the base frequency is approximately 2.7 kHz.
To reduce current consumption, the cyclic sense function can be used to read a switch.
The switch will be supplied and read back periodically.
In this data sheet basic knowledge of the “LIN diagnostic and configuration specification,
Rev. 2.0” is expected.
The UJA1023 conforms to the “LIN diagnostic and configuration specification, Rev. 2.0”
and is compatible with LIN 1.3.
The UJA1023 can be configured via the LIN command frames ‘Master Request’
(MasterReq) and ‘Slave Response’ (SlaveResp). Both frames consist of eight data bytes.
The MasterReq is used to send configuration data from the master to the slaves, whereas
the slave being addressed by the prior MasterReq will answer with the related data on
demand.
Rev. 04 — 5 July 2006
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
UJA1023
LIN-I/O slave
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