sm5308a Seiko NPC Corp., sm5308a Datasheet - Page 16

• Manufacturer Part Number: sm5308a
• Description: 3-channel Video Buffer
• Manufacturer: Seiko NPC Corp.

(7) Maximum number of slave addresses
Register name: CONDITION2
Flag name: NCA
The NCA flag sets the maximum number of slave address selected by the ADS input pins to either 2 or 3 by
setting of the NAC resistor. The ADS input pin equivalent circuit is shown below.
When NCA = LOW, switches SW31 to SW33 are OFF and 2 ADS input levels (LOW or HIGH) are valid.
When NCA = HIGH, switches SW31 to SW33 are ON and 3 ADS input levels (LOW, HIGH, and Open) are
valid. In this time, the current consumption increases by several hundreds µA compared to the NCA = “L”
setting.
Note.The default value for NCA plug is HIGH (3 address). If NCA is once set to LOW (2 address) for a
Flag name
device addressed by the setting when ADS is Open, that device is subsequently no longer accessible
until power supply turns OFF.
NCA
H
L
Maximum number of
(2-address mode)
(3-address mode)
slave address
ADS
2
3
SW31
SW21
Default
SW32
SM5308AS
NCA=2
NCA=3
SW33
ADS pin setting
HIGH
Open
HIGH
Open
LOW
LOW
NCA=L(2)
NCA=H(3)
I C Control
2
Slave address
1001000
1001001
1001000
1001001
1001010
Invalid
Address
decoder
SEIKO NPC CORPORATION —16
current flow
ADS pin
Yes
No