SM5302A

NIPPON PRECISION CIRCUITS INC.—16

(7) Filter bypass mode

Register name: CONDITION2

Flag name: BYPASS

This flag allows the lowpass filter to be bypassed. The output gain can be switched, even in filter bypass

mode. The input type, multiplexer function, and output gain can all be set just as in filter mode. However,

the cutoff frequency and fc mode settings have no effect on the outputs.

(8) Maximum number of slave addresses

Register name: CONDITION2

Flag name: NCA

The NCA flag sets the maximum number of slave addresses to either 2 or 3. The NCA setting modifies the

ADS input pin equivalent circuit as shown below.

When NCA

= LOW (max = 2), switches SW31 to SW33 are OFF, reducing the current consumed in com-

parison to when NCA

= HIGH (max = 3). Note that only 2 ADS input levels (LOW or HIGH) are valid.

When NCA

= HIGH (max = 3), switches SW31 to SW33 are ON and hence current is consumed regardless

of whether the ADS input is LOW, HIGH, or Open. However, note that 3 ADS input levels are valid.

Note. The default value for NCA is HIGH (max

= 3). If NCA is once set to LOW (max = 2) for a device

addressed by the setting when ADS is Open, that device is subsequently no longer accessible.

Flag name

Filter

Default

BYPASS

L

Filter mode

(signals pass through lowpass filter)

H

Filter bypass mode

(signals bypass lowpass filter)

Flag name

Maximum number of

slave address

Default

ADS level

Slave address

ADS pin

current flow

NCA

L

2

(2-address mode)

LOW

HIGH

Open

1001000

1001001

Invalid

No

H

3

(3-address mode)

LOW

HIGH

Open

1001000

1001001

1001010

Yes

ADS

Address

decoder

NCA=2

NCA=3

SW21

SW31

SW32

SW33

NCA=L(2)

NCA=H(3)

I C Control

2