Manual
MAX9670/MAX9671
Low-Power Audio/Video Switch with Audio
Volume Control for Dual SCART Connectors
12 ______________________________________________________________________________________
Pin Description
PIN
MAX9670 MAX9671
NAME FUNCTION
1 1 SDA Bidirectional I
2
C Data I/O. Output is open drain and tolerates up to 3.6V.
2 2 SCL I
2
C Clock Input
3 3 DEV_ADDR Device Address Set Input. Connect to GNDVID, V
VID
, SDA or SCL. See Table 3.
44 INT
Interrupt Output. This is an open-drain output that pulls down to GNDVID to
indicate a change in the VCR slow switching or fast switching input, the activity
status of the composite video inputs, or the load status of the composite video
outputs.
55 V
AUD
Audio Supply. Connect to a 3.3V supply. Bypass with a 10µF aluminum
electrolytic capacitor and a 0.47µF ceramic capacitor to EP.
6 6 C1P
Charge-Pump Flying Capacitor Positive Terminal. Connect a 0.47µF capacitor
from C1P to C1N.
7 7 C1N
Charge-Pump Flying Capacitor Negative Terminal. Connect a 0.47µF capacitor
from C1P to C1N.
8 8 CPVSS C har g e- P um p N eg ati ve P ow er S up p l y. Byp ass w i th a 1µF cer am i c cap aci tor to E P .
9 9 ENC_INL Encoder Left-Channel Audio Input
10 10 ENC_INR Encoder Right-Channel Audio Input
— 11 TV_INL TV SCART Left-Channel Audio Input
— 12 TV_INR TV SCART Right-Channel Audio Input
11 13 VCR_INL VCR SCART Left-Channel Audio Input
12 14 VCR_INR VCR SCART Right-Channel Audio Input
13 15 TV_OUTL TV SCART Left-Channel Audio Output
14 16 VCR_OUTL VCR SCART Left-Channel Audio Output
15 17 VCR_OUTR VCR SCART Right-Channel Audio Output
16 18 TV_OUTR TV SCART Right-Channel Audio Output
17 19 TV_SS TV SCART Bidirectional Slow-Switch Signal
18 20 V
12
+12V Supply for the Slow Switching Circuit. Bypass with a 10µF + 0.47µF ceramic
capacitor to EP.
19 21 VCR_SS VCR SCART Bidirectional Slow-Switch Signal
20 22 TVOUT_FS TV SCART Fast-Switching Logic Output
— 23, 44 N.C. No Connection. Leave unconnected.
21 24 VCRIN_FS VCR SCART Fast-Switching Logic Input
22 25 ENC_B_IN Encoder Blue Video Input
23 26 ENC_G_IN Encoder Green Video Input
24 27 VCR_B_IN VCR SCART Blue Video Input
25 28 VCR_G_IN VCR SCART Green Video Input
26 29 TV_B_OUT TV SCART Blue Video Output
27 30 TV_G_OUT TV SCART Green Video Output