SMM766
Preliminary Information
PIN DESCRIPTIONS (Cont.)
Pin
Number
Pin
Type
Pin Name
Pin Description
SEQ_LINK (Sequence-Link™) is an open drain bi-directional pin. This pin
should be attached to other Sequence-Link devices, during linked operation.
SEQ_LINK must be pulled high through an external pull-up resistor when
multiple Sequence-Link devices are used. When the SMM766 is not used
with another Sequence-Link device, SEQ_LINK should be tied directly to
ground.
VREF (Voltage Reference) is a bi-directional analog pin. VREF is used for
Active DC Output Control and margining. VREF can be programmed to
output the internal 1.25V reference.
FILT_CAP (Filter Capacitor) is an external capacitor input used to filter VM
X
inputs.
VM
X
(Voltage Monitor) pins are analog inputs. These pins are normally
attached to the positive converter sense line, VM
A
through VM
F.
External capacitor input used to filter the VM
X
inputs to the 10-bit ADC, CAP
A
through CAP
F
. This provides an RC filter where R = 25kΩ..
PUP
X
(Power Up Permitted) pins are programmable active high/low open
drain converter enable output, PUP
A
through PUP
F.
Output voltage used to control the output of DC/DC converters, TRIM
A
through TRIM
F.
If the ADOC/margining functionality is not used on a channel
the associated TRIM
X
pin should be grounded.
TRIM_CAP
X
is an analog output pin used to control the output of DC/DC
converters. If the ADOC/margining functionality is not used on a channel the
associated TRIM_CAP
X
pin should be left floating. There are 6 TRIM_CAP
X
pins, TRIM_CAP
A
through TRIM_CAP
F
.
Power supply of the part
12VIN (12 Volt Input) is a power supply input internally regulated to either
3.6V or 5.5V.
VDD_CAP (VDD Capacitor) is an external capacitor input used to filter the
internal supply.
13
I/O
SEQ_LINK
14
15
41,36,
31,26,
21,16
42,37,
32,27,
22,17
43,38,
33,28,
23,18
44,39,
34,29,
24,19
45,40,
35,30,
25,20
46
47
48
I/O
CAP
IN
CAP
OUT
VREF
FILT_CAP
VM
X
CAP
X
PUP
X
OUT
TRIM
X
CAP
TRIM_CAP
X
VDD
12VIN
VDD_CAP
PWR
PWR
CAP
Summit Microelectronics, Inc
2086 2.1 12/13/2005
6
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
