aduc7030 Analog Devices, Inc., aduc7030 Datasheet - Page 128

• Manufacturer Part Number: aduc7030
• Description: Integrated Precision Battery Sensor For Automotive
• Manufacturer: Analog Devices, Inc.

ADuC7030/ADuC7033
SERIAL TEST INTERFACE
The ADuC7030/ADuC7033 incorporate a single pin, serial test
interface (STI) port that can be used for end-customer
evaluation or diagnostics on finished production units.
The STI port transmits from 1 to 6 bytes of data in 12-bit
packets. As shown in Figure 39 below, each transmission packet
includes a start bit, the transmitted byte (8 bits), an even parity
bit and two stop bits. The STI data is transmitted on the STI pin
and the baud rate is determined by the overflow rate of Timer4.
The STI port is configured and controlled via six MMRs,
namely:
- STIKEY0:
- STIKEY1:
- STIDAT0:
- STIDAT1:
- STIDAT2:
- STICON:
STI Key0 Register:
Name:
Address:
Access:
Function:
STIKEY0
0xFFFF0880
Write Only
The STIKEY0 MMR is used in conjunction with
the STIKEY1 MMR to protect the STICON MMR.
STIKEY0 must be written with 0x0007
immediately before any attempt is made to write to
STICON. STIKEY1 must be written with 0x00B9
immediately after STICON is written to ensure the
STICON write sequence is completed successfully.
If STIKEY0 is not written, is written out of
sequence or is written incorrectly, any subsequent
write to the STICON MMR will be ignored.
Serial Test Interface key 0.
Serial Test Interface key 1.
Data (16-Bit) 0 – holds 2 bytes
Data (16-Bit) 1 - holds 2 bytes
Data (16-Bit) 2 - holds 2 bytes
Controls the Serial Test Interface
Rev. PrE | Page 128 of 150
STI Key1 Register:
Name:
Address:
Access:
Function:
STI DATA0 Register:
Name:
Address:
Default
Value:
Access:
Function:
Figure 39. Serial ADC Test Interface Example- 3 Byte Transmission
PARITY BIT
STI BYTE0
STIKEY1
0xFFFF0888
Write Only
The STIKEY01 MMR is used in conjunction with
the STIKEY0 MMR to protect the STICON MMR.
STIKEY1 must be written with 0x00B9
immediately after any attempt is made to write to
STICON. STIKEY0 must be written with 0x0007
immediately before STICON is written to ensure
the STICON write sequence is completed
successfully. If STIKEY1 is not written, is written
out of sequence or is written incorrectly, any
previous write to the STICON MMR will be
ignored.
STIDAT0
0xFFFF088C
0x0000
Read/Write
The STIDAT0 MMR is a 16-bit register which is
used to hold the first and second data bytes that
will be transmitted on the STI pin once the STI
port is enabled. The first byte to be transmitted
will occupy bits0-7 and the second byte will
occupy bits 8-15.
Preliminary Technical Data
START BIT
STI BYTE1
PAIRTY BIT
WITH 2 STOP BITS
STI BYTE2