DS4305K Maxim Integrated, DS4305K Datasheet - Page 6

• Manufacturer Part Number: DS4305K
• Description: Power Management IC Development Tools
• Manufacturer: Maxim Integrated
• Series: DS4305, DS4305Kr

Specifications of DS4305K

• Part # Aliases: 90-4305K-000

Electronically Programmable
Voltage Reference
Figure 1. Timing Diagram
6
GND
ADJ
V
V
CC
IN
PIN
1
2
3
4
5
_____________________________________________________________________
V
CC
R
V
PU
V
ADJ
OUT
NAME
IN
V
V
GND
ADJ
V
V
CC
OUT
CC
IN
R
PD
t
ADJ
Adjust Control Input
Ground
Sample Voltage Input
Voltage Output
Power-Supply Voltage
CONTROL
EEPROM
ADC
AND
FIRST PROGRAMMING CYCLE
∆V
OUT
Pin Description
Block Diagram
x t
FUNCTION
ST
DS4305
12-BIT
V
DAC
REF
∆V
OUT
t
W
V
OUT
t
∆V
ADJ
OUT
The DS4305 provides a precise, NV output voltage,
V
of embedded systems. The DS4305 output voltage can
be adjusted over almost the entire operating supply
range of the device, and it can be precisely set to with-
in ±1.5mV. A graphical description of the DS4305 is
provided in the block diagram.
During factory calibration, a simple adjustment proce-
dure must be followed. This entire procedure includes
setting V
and waiting for the completion of the EEPROM storage
cycle (see the timing diagram in Figure 1). At the start
of calibration, a voltage must be placed on V
voltage needs to be completely stable before the
adjustment procedure begins, and it must remain sta-
ble throughout the entire adjustment procedure. The
DS4305 starts its self-adjust procedure when the ADJ
pin is pulled low and held low for at least t
which it can be released at any time. Once ADJ has
been released, it should not be toggled again for the
remainder of the adjustment procedure. After the falling
edge on ADJ and the wait time, t
adjust period begins. The length of the V
period can be determined using the formula
∆V x t
ADDITIONAL PROGRAMMING CYCLES (IF REQUIRED)
OUT
∆V
, making it an ideal solution for factory calibration
ST
OUT
, where ∆V is | V
IN
x t
ST
, toggling ADJ, waiting as V
t
W
Detailed Description
OUT OLD
t
ADJ
- V
ADJ
OUT NEW
OUT
, the V
OUT
self-adjusts,
self-adjust
|.
ADJ
OUT
IN
, after
. This
self-