71M6541DSLASHFSLASHG datasheet(79/166 Pages) MAXIM

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

Rev 5

The TMUXOUT and TMUX2OUT pins may be used for diagnostics purposes during the product

development cycle or in the production test. The RTC 1-second output may be used to calibrate the

crystal oscillator. The RTC 4-second output provides higher precision for RTC calibration. RTCLK may

also be used to calibrate the RTC.

Table 65: TMUX[5:0] Selections

TMUX[5:0]

Signal Name

Description

RTCLK

32.768 kHz clock waveform

WD_RST

Indicates when the MPU has reset the watchdog timer. Can be

monitored to determine spare time in the watchdog timer.

CKMPU

MPU clock – see Table 9

V3AOK bit

Indicates that the V3P3A pin voltage is ≥ 3.0 V. The V3P3A and

V3P3SYS pins are expected to be tied together at the PCB level.

The 71M654x monitors the V3P3A pin voltage only.

V3OK bit

Indicates that the V3P3A pin voltage is ≥ 2.8 V. The V3P3A and

V3P3SYS pins are expected to be tied together at the PCB level.

The 71M654x monitors the V3P3A pin voltage only.

MUX_SYNC

Internal multiplexer frame SYNC signal. See Figure 6 and Figure

CE_BUSY interrupt

See 2.3.3 on page 25 and Figure 16 on page 47

CE_XFER interrupt

RTM output from CE

See 2.3.5 on page 25

Note:

All

TMUX[5:0] values which are not shown are reserved.

Table 66: TMUX2[4:0] Selections

TMUX2[4:0]

Signal Name

Description

WD_OVF

Indicates when the watchdog timer has expired (overflowed).

PULSE_1S

One second pulse with 25% Duty Cycle. This signal can be used

to measure the deviation of the RTC from an ideal 1 second

interval. Multiple cycles should be averaged together to filter out

jitter.

PULSE_4S

Four second pulse with 25% Duty Cycle. This signal can be used

to measure the deviation of the RTC from an ideal 4 second

interval. Multiple cycles should be averaged together to filter out

jitter. The 4 second pulse provides a more precise measurement

than the 1 second pulse.

RTCLK

32.768 kHz clock waveform

SPARE[1] bit – I/O RAM

0x2704[1]

Copies the value of the bit stored in 0x2704[1]. For general

purpose use.

SPARE[2] bit – I/O RAM

0x2704[2]

Copies the value of the bit stored in 0x2704[2]. For general

purpose use.

WAKE

Indicates when a WAKE event has occurred.

MUX_SYNC

Internal multiplexer frame SYNC signal. See Figure 6 and Figure

MCK

See 2.5.3 on page 50

GNDD

Digital GND. Use this signal to make the TMUX2OUT pin static.

INT0 – DIG I/O

Interrupt 0. See 2.4.8 on page 41. Also see Figure 16 on page 47.

INT1 – DIG I/O

INT2 – CE_PULSE

INT3 – CE_BUSY

INT4 - VSTAT

INT5 – EEPROM/SPI

INT6 – XFER, RTC

RTM_CK (flash)

See 2.3.5 on page 25.

Note:

All

TMUX2[4:0] values which are not shown are reserved.

71M6541D/F/G Datasheet(PDF) 79 Page - Maxim Integrated Products

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