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IC-HF Datasheet(PDF) 11 Page - IC-Haus GmbH |
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IC-HF Datasheet(HTML) 11 Page - IC-Haus GmbH |
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11 / 36 page  preliminary preliminary iC-HF 6-CH. ENCODER LINK, RS-422 DRIVER/RECEIVER Rev C1, Page 11/36 FUNCTION DESCRIPTION iC-HF has 4 function modes. Each function mode com- bines the unidirectional and bidirectional channels with a specific configuration. iC-HF can be operated as a six channel line driver, as a 6 lines transceiver with BiSS/SSI connectivity or as a bus capable BiSS slave transceiver inserted in a BiSS bus structure. The 4 function modes are the following: • A/B/Z and U/V/W • A/B/Z and BiSS/SSI • BiSS bus structure • BiSS bus loopback Selection of iC-HF’s function mode is set by the pins FMSEL2 and FMSEL1: FMSEL2 FMSEL1 MODE 0 0 A/B/Z and U/V/W 0 1 A/B/Z and BiSS/SSI 1 1 BiSS bus structure 1 0 BiSS bus loopback Table 4: Mode Configurations FMSELx pins include pull-down resistors. When there is no external connection to FMSELx pins, A/B/Z and U/V/W is the default selected mode. A/B/Z and U/V/W Mode If FMSEL2 = 0 and FMSEL1 = 0, iC-HF is configured in A/B/Z and U/V/W mode. A/B/Z and U/V/W mode is the default mode. In this mode all 6 channels work as line drivers. Single ended input signals at pins X1 to X6 are converted into differential output signals at pins Q1/NQ1 to Q6/NQ6. Output signals follow RS-422 standard. Output Enable pin ”OEN” must be set hi to enable differ- ential output signals. When working as 6-channel line driver, pins NX1 to NX3 are disabled. An example of iC-HF working as a 6-channel line driver is presented in figure 8. RS422 Output BYP REVERSE POLARITY PROTECTION BYPR OVT PoDo CONTROL REQUEST OVERTEMP RS422 Output 1 μF 1 μF iC-HF 3..5.5V ENCODER LINK DETECTION TRI OVT LOGIC PoDo RS422 Output RS422 Output RS422 Output RS422 Output POWER DOWN 1 NQ2 Q2 X2 GND VDD Q5 NQ5 X5 X6 Q6 NQ6 PTC NX1 NX2 VDDS EBIS X3 Q3 NQ3 NX3 ECM FMSEL2 FMSEL1 OEN NERR X1 Q1 NQ1 GNDS NERRI NQ1 Q1 TRI X4 Q4 NQ4 1 Figure 8: A/B/Z and U/V/W mode, 6 channel line driver In A/B/Z and U/V/W mode it is possible to enter En- coder Link State. If Encoder Link State in this mode is entered, signals at pins X1 to X6 are directly linked to output pins Q1 to Q6. Input signals at pins NX1 to NX3 are also linked to output pins NQ1 to NQ3. Alto- gether, 9 lines are available in A/B/Z and U/V/W mode in Encoder Link State. To enter Encoder Link State, ECM pin must be set hi and two signals must be input at pins Q1 and NQ1 following a specific timing sequence. This timing se- quence is called Encoder Link Sequence. More infor- mation about entering Encoder Link State on page 20. OVT PoDo CONTROL iC-HF 3..5.5V Encoder Link LOGIC Encoder Link TRI BYP OVT Encoder Link REVERSE POLARITY PROTECTION PoDo 1 μF 1 μF ENCODER LINK REQUEST DETECTION POWER DOWN OVERTEMP Encoder Link Encoder Link Encoder Link BYPR 1 X6 NQ6 GND VDD Q5 NQ5 PTC VDDS NX3 ECM FMSEL2 FMSEL1 OEN NERR Q1 NQ1 GNDS NERRI X4 Q4 NQ4 X2 NQ1 X1 Q1 NX1 Q2 NQ2 NX2 Q3 X3 X5 NQ3 EBIS Q6 1 Figure 9: A/B/Z and U/V/W mode, 9 lines in Encoder Link State A/B/Z and BiSS/SSI mode If FMSEL2 = 0 and FMSEL1 = 1, iC-HF is configured in A/B/Z and BiSS/SSI mode. In A/B/Z and BiSS/SSI Mode channels 1, 2 and 3 work as line drivers, similar to A/B/Z and U/V/W mode. Channels 4, 5 and 6 are used for implementing BiSS/SSI communication in RS-422. This allows com- |
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