71M6541DSLASHFSLASHG datasheet(17/166 Pages) MAXIM

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

Rev 5

processed with locally connected sensors, as shown in Figure 3. When using one local and one remote

sensor (Figure 5), the multiplexer sequence is also as shown in Figure 7.

For both multiplexer sequences shown in Figure 6 and Figure 7, the frame duration is 13 CK32 cycles

(where CK32 = 32768 Hz), therefore, the resulting sample rate is 32768 Hz / 13 = 2520.6 Hz.

Table 3 summarizes the various AFE input configurations.

CK32

MUX STATE

MUX_DIV[3:0] = 3 Conversions

Settle

Multiplexer Frame

CROSS

MUX_SYNC

11/5/2010

Fig. 2:

Fig. 3:

Not Used

Fig. 5:

Figure 6: States in a Multiplexer Frame (MUX_DIV[3:0] = 3)

CK32

MUX STATE

MUX_DIV = 4 Conversions

Settle

Multiplexer Frame

CROSS

MUX_SYNC

11/5/2010

Fig. 4:

Figure 7: States in a Multiplexer Frame (MUX_DIV[3:0] = 4)

Table 3: ADC Input Configuration

ADC

Channel

Required

Setting

Comment

IAP

ADC0

DIFFA_E = 1

Differential mode must be selected with DIFFA_E = 1 (I/O

RAM 0x210C[4]). The ADC results are stored in CE RAM

location ADC0 (CE RAM 0x0), and ADC1 (CE RAM 0x1) is not

disturbed.

IAN

ADC1

IBP

ADC2

DIFFB_E = 1

RMT_E = 1

For locally connected sensors (Figure 2 and Figure 4), the

differential input must be enabled by setting DIFFB_E (I/O

RAM 0x210C[5].

For the remote connected sensor (Figure 3 and Figure 5)

with a remote shunt sensor, RMT_E (I/O RAM 0x2709[3])

must be set.

In both cases, the ADC results are stored in RAM location

ADC2 (CE RAM 0x2), and ADC3 (CE RAM 0x3) is not

disturbed.

IBN

ADC3

ADC10

Single-ended mode only. The ADC result is stored in RAM

location ADC10 (CE RAM 0xA).

ADC9

Single-ended mode only (71M6542F only). The ADC result

is stored in RAM location ADC9 (CE RAM 0x9).

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