SMT4214 Summit Microelectronics, Inc., SMT4214 Datasheet - Page 6

• Manufacturer Part Number: SMT4214
• Description: Expandable Four-rail Supply TRAKKER™ Controller
• Manufacturer: Summit Microelectronics, Inc.

PIN DESCRIPTIONS
Summit Microelectronics, Inc
Number
Pin
10
11
12
13
14
1
2
3
4
5
6
7
8
9
Type
PWR
Pin
I/O
I/O
I/O
O
I
I
I
I
I
I
I
I
I
IRQ_CLR#
PWR_ON#
VGG_CAP
SEATED#
Pin Name
RST#
VOD
VOC
VOB
VOA
SDA
MR#
FS#
A0
A1
SDA is the bi-directional serial data pin. It is configured as an open drain output.
SDA is internally connected to VDD_CAP through a 100kΩ pull-up resistor. In
multiple device systems, an external pull-up should be connected to the highest
supply
The Manual Reset input is an active low input, internally connected to VDD_CAP
through a 100kΩ pull-up resistor. Taking MR# low will force the RST# output
low. MR# must be forced low when writing to the configuration registers.
Interrupt Clear is an active low input. Forcing IRQ_CLR# low will clear the IRQ#
output provided that it is not being driven by an under-voltage condition.
IRQ_CLR# is internally connected to VDD_CAP through a 100kΩ pull-up
resistor.
Force Shutdown is an active low open-drain I/O internally connected to
VDD_CAP through a 100kΩ pull-up resistor. FS# can be asserted either by an
outside signal or by a programmable under-voltage condition. If FS# is brought
low, the SMT4214 will immediately take the VGATE outputs to 0V. If multiple
SMT4214’s are used on a single board, the FS# outputs can be tied together. In
this configuration it is possible for a fault condition on one SMT4214 to shutdown
all of the SMT4214’s on a system.
The Power-On input must be low for the SMT4214 to begin turning on the
VGATE outputs. PWR_ON# is internally connected to VDD_CAP through a
100kΩ pull-up resistor, therefore its normal state is not active. PWR_ON# must
be held in its inactive state while writing to the configuration registers. Once the
power-on operation has completed, de-asserting the PWR_ON# input will force
the ‘tracked’ channels to power down and then clamp all VGATE outputs to
ground.
VGG_CAP is a charge storage connection for the charge pump. This capacitor
provides current to the VGATE outputs under varying load conditions. VGG_CAP
should nominally be 1µF.
The SEATED# is an active low input, internally connected to VDD_CAP through
a 100kΩ pull-up resistor. The SEATED# input is effectively an enable input that
must be low for t
generally tied to the ‘short pin’ in a staggered pin connector. When the card is
removed, SEATED# will go high and will initiate a power-off operation.
The address pins are biased either to VDD_CAP or GND and provide a
mechanism for assigning a unique bus address to the SMT4214. AO and A1 are
internally connected to VDD_CAP through a 100kΩ pull-up resistor
The Voltage Output monitor inputs are used to monitor the ‘card-side’ voltages
for the individual managers. . See Figure 8 for additional external component
recommendations.
Reset is an active low open-drain output. It will be driven low whenever the MR#
input is low. RST# can be programmed so that it is asserted on an under-voltage
condition.
SEATED
2061 1.0 8/16/02
before the power-on operation can proceed. It is
Pin Description
Preliminary Information
SMT4214
6