IC-MQ Datasheet, PDF(29/39 Page) IC-Haus GmbH – PROGRAMMABLE 9-BIT Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

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IC-MQ Datasheet, PDF (29/39 Pages) IC-Haus GmbH – PROGRAMMABLE 9-BIT Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

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iC-MQ PROGRAMMABLE 9-BIT

Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

Rev D4, Page 29/39

Output Driver Conï¬guration

The output drivers can be used as push-pull, lowside

or highside drivers; the mode of operation is deter-

mined by TRIHL(1:0).

In order to avoid steep edges when transmitting via

short wires the slew rate can be set using SSR to suit

the length of the cable. This can result in a limiting

of the maximum permissible output frequency if at the

same time the RS422 speciï¬cation is to be adhered

to (for example, to 300 kHz at a slew rate of 300 ns;

the tolerances in Electrical Characteristics, numbers

506/507, must be observed).

The driver output short-circuit current can be set by

SIK and can be minimized when connecting to logic or

to an external 24 V line driver. If the outputs are used

as RS422-compatible 5 V drivers, it is recommended

that SIK = 11 to keep the power dissipation of iC-MQ

low.

TRIHL

Code

Adr 0x1E, bit 1:0

Function

Push-pull operation

Highside driver mode (P channel open drain)

Lowside driver mode (N channel open drain)

Not permitted

Table 49: Output Drive Mode

SSR

Code

Note

Adr 0x1E, bit 3:2

Function

Nominal value 12 ns

Nominal value 25 ns

Nominal value 80 ns

Nominal value 220 ns

See Elec. Char. Nos. 506/507

Table 50: Output Slew Rate

SIK

Code

Note

Adr 0x1E, bit 5:4

Function

typ. 2 mA, linking logic or driver ICs

typ. 8 mA

typ. 40 mA

typ. 100 mA, recommended for RS422

See Elec. Char. Nos. 503/504

Table 51: Output Short-Circuit Current

Minimum Phase Distance

The minimum phase distance for A/B/Z and

CPD/CPU/CP output signals can be preselected using

MTD(3:0). This setting limits the maximum possible

output frequency for safe transmission to counters

which cannot debounce spikes or only permit a low

input frequency.

When preselecting the minimum edge distance the

conï¬guration of the RS422 output drivers (with regard

to the driver current and slew rate) and the length of

cable used must be taken into account.

MTD

Code

0x0

0x1

0x2

0x3

0x4

0x5

0x6

0x7

0x8

0x9

0xA

0xB

0xC

0xD

0xE

0xF

Note

Adr 0x1D, bit 7:4

Mode ABZ : tMTD

Mode 191/193: tclk()lo

220 ns

110 ns

410 ns

205 ns

600 ns

300 ns

800 ns

400 ns

1.0 Âµs

500 ns

1.2 Âµs

600 ns

1.4 Âµs

700 ns

1.6 Âµs

800 ns

220 ns

50 ns

410 ns

50 ns

600 ns

50 ns

800 ns

50 ns

1.0 Âµs

50 ns

1.2 Âµs

50 ns

1.4 Âµs

50 ns

1.6 Âµs

50 ns

All timing speciï¬cations are nominal values, see

Elec. Char. No. 515 for tolerances.

Table 52: Minimum Phase Distance

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