71M6541DSLASHFSLASHG datasheet(121/166 Pages) MAXIM

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71M6541D/F/G and 71M6542F/G Data Sheet

Rev 5

121

Name

Location

Rst Wk

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Description

PLS_INTERVAL[7:0]

210B[7:0]

R/W

PLS_INTERVAL[7:0] determines the interval time between pulses. The time

between output pulses is PLS_INTERVAL[7:0]*4 in units of CK_FIR clock

cycles. If PLS_INTERVAL[7:0] = 0, the FIFO is not used and pulses are output

as soon as the CE issues them. PLS_INTERVAL[7:0] is calculated as follows:

PLS_INTERVAL[7:0] = Floor ( Mux frame duration in CK_FIR cycles / CE pulse

updates per Mux frame / 4 )

For example, since the 71M654x CE code is written to generate 6 pulses in one

integration interval, when the FIFO is enabled (i.e., PLS_INTERVAL[7:0]

≠ 0)

and that the frame duration is 1950 CK_FIR clock cycles, PLS_INTERVAL[7:0]

should be written with Floor(1950 / 6 / 4) = 81 so that the five pulses are

evenly spaced in time over the integration interval and the last pulse is issued

just prior to the end of the interval. See 2.3.6.2 VPULSE and WPULSE.

PLS_INV

210C[0]

R/W

Inverts the polarity of WPULSE, VARPULSE, XPULSE and YPULSE.

Normally, these pulses are active low. When inverted, they become active

high.

PORT_E

270C[5]

R/W

Enables outputs from the pins SEGDIO0-SEGDIO15. PORT_E = 0 after reset

and power-up blocks the momentary output pulse that would occur on

SEGDIO0 to SEGDIO15.

PRE_E

2704[5]

R/W Enables the 8x pre-amplifier.

PREBOOT

SFRB2[7]

–

Indicates that pre-boot sequence is active.

RCMD[4:0]

SFR FC[4:0]

R/W

When the MPU writes a non-zero value to RCMD[4:0], the IC issues a

command to the appropriate remote sensor. When the command is complete,

the IC clears RCMD[4:0].

RESET

2200[3]

When set, writes a one to WF_RSTBIT and then causes a reset.

RFLY_DIS

210C[3]

R/W

Controls how the IC drives the power pulse for the 71M6x01. When set, the

power pulse is driven high and low. When cleared, it is driven high followed

by an open circuit fly-back interval.

RMT_E

2709[3]

R/W

Enables the remote digital isolation interface, which transforms the IBP-IBN

pins into a digital balanced differential pair. Thus, enabling these pins to

interface to the 71M6x01 isolated sensor.

RMT_RD[15:8]

RMT_RD[7:0]

2602[7:0]

2603[7:0]

Response from remote read request.

RTC_FAIL

2890[4]

Indicates that a count error has occurred in the RTC and that the time is not

trustworthy. This bit can be cleared by writing a 0.

71M6541D/F/G Datasheet(PDF) 121 Page - Maxim Integrated Products

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