Datasheet

DS2480B
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Table 4. CONFIGURATION PARAMETER VALUE CODES
Value Codes
Parameter Code 000 001 010 011 100 101 110 111 Unit
001 (PDSRC) 15 2.2 1.65 1.37 1.1 0.83 0.7 0.55 V/µs
010 (PPD) 32 64 128 256 512 1024 2048

µs
011 (SPUD) 16.4 65.5 131 262 524 1048 Note

ms
100 (W1LT) 8 9 10 11 12 13 14 15 µs
101 (DSO/W0RT) 3 4 5 6 7 8 9 10 µs
110 (LOAD) 1.8 2.1 2.4 2.7 3.0 3.3 3.6 3.9 mA
111 (RBR) 9.6 19.2 57.6 115.2 9.6 19.2 57.6 115.2 kbps
Note: The value code 110 of parameter 011 (Strong Pullup Duration) must not be used since it could
cause unexpected results.
The syntax of configuration commands is very simple. Each 8-bit code word contains a 3-bit parameter
code to specify the parameter and the 3-bit value code to be selected. Bit 7 of the command code is set to
0 and bit 0 is always a 1. To read the value code of a parameter, one writes all 0s for the parameter code
and puts the parameter code in place of the parameter value code. Table 5 shows the details.
The configuration command response byte is similar to the command byte itself. Bit 0 of the response
byte is always 0. When writing a parameter, the upper 7 bits are the echo of the command code. When
reading a parameter, the current value code is returned in bit positions 1 to 3 with the upper 4 bits being
the same as sent (see Table 6).
Table 5. CONFIGURATION COMMAND CODES
FUNCTION BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
Write Parameter 0 parameter code parameter value code 1
Read Parameter 0 0 0 0 parameter code 1
Table 6. CONFIGURATION COMMAND RESPONSE BYTE
FUNCTION BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
Write Parameter 0 same as sent same as sent 0
Read Parameter 0 same as sent parameter value code 0