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19-1349; Rev 1a; 10/98
MAX847 Evaluation Kit
General Description
The MAX847 evaluation kit (EV kit) provides a platform
for evaluating the features of the MAX847. The MAX847
converts a 1-cell, 0.8V to 1.8V battery voltage to four
separate output voltages. The main output voltage at
OUT is digitally controlled from 1.8V to 4.9V in 100mV
steps by a 3-wire SPI™ serial interface. OUT provides up
to 80mA. The other outputs (REG1, REG2, and REG3)
are low-noise linear-regulator outputs. The MAX847
offers numerous features for two-way paging and other
low-power wireless designs. Consult the MAX847 data
sheet for details. The MAX847 EV kit is a fully assembled
and tested surface-mount circuit board.
The MAX769 is similar to the MAX847 except that it
contains a buck/boost DC-DC converter (for 2-cell or
3-cell inputs) rather than a boost-only converter (for
1-cell inputs). To evaluate the MAX769, please order
the MAX769EVKIT.
Features
o
0.8V to 1.8V (1-cell boost) Battery Input Voltage
o
1.8V to 4.9V Digitally Adjustable Output Voltage
o
Up to 80mA Total Output Current
o
Three Low-Noise Voltage Regulators
o
Charger for Small NiCd/NiMH/Lithium Battery
or Storage Capacitor
o
270kHz Switching Frequency
o
15µA Idle Mode™ Current
o
Digitally Controlled 1.8Ω Switches for Vibrators,
Beepers, etc.
o
Reset and Low-Battery Outputs
o
Surface-Mount Components
o
Fully Assembled and Tested
Evaluates: MAX847
Ordering Information
PART
MAX847EVKIT
TEMP. RANGE
0°C to +70°C
IC PACKAGE
28 QSOP
Component List
DESIGNATION
C1, C2
C3, C8, C10,
C12, C13, C15,
C16
C4
C5, C9, C14
C6, C7
C11
D1
L1
R1
R2, R3, R6, R8,
R11, R13, R18,
R22
QTY
2
DESCRIPTION
47µF, 16V low-ESR tantalum caps
Sprague 593D476X0016E2W or
AVX TPSD476M016R0150
0.1µF ceramic capacitors
22nF ceramic capacitor
1µF ceramic capacitors
10µF, 10V tantalum capacitors
Sprague 595D106X0010A2T
1000pF ceramic capacitor
0.5A, 20V Schottky diode (optional)
Motorola MBR0520L
22µH inductor
Sumida CD54-220
15kΩ, 5% resistor
1kΩ, 5% resistors
DESIGNATION
R4, R7, R9, R10,
R17, R19, R20,
R23
R5
7
1
3
2
1
0
1
1
8
R12
R15
R14, R16
R21
U1
JU1–JU10
JU11
JU12
J1
SW1–SW4
J2
LED1
None
None
QTY
8
1
1
1
2
1
1
10
1
1
1
4
1
1
1
1
DESCRIPTION
100kΩ, 5% resistors
100Ω, 5% resistor
390kΩ, 5% resistor
1MΩ, 5% resistor
620kΩ, 5% resistors
10kΩ, 5% resistor
MAX847EEI
2-pin headers
3-pin header
4-pin header
6-pin header
Slide switches
25-pin, female right-angle
connector
Green light-emitting diode
MAX847/MAX769 PC board
MAX847 data sheet
Idle Mode is a trademark of Maxim Integrated Products.
SPI is a trademark of Motorola Corp.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX847 Evaluation Kit
Evaluates: MAX847
Component Suppliers
SUPPLIER
AVX
CoilCraft
Coiltronics
Dale-Vishay
Motorola
Sprague
Sumida
Vishay/Vitramon
PHONE
803-946-0690
708-639-6400
561-241-7876
402-564-3131
602-303-5454
603-224-1961
708-956-0666
203-268-6261
FAX
803-626-3123
708-639-1469
561-241-9339
402-563-6418
602-994-6430
603-224-1430
708-956-0702
203-452-5670
Manual Programming
The MAX847 is designed to be controlled by a serial
interface; however, slide-switches SW1–SW4 and LED1
are provided on the EV kit to assist in “bench-top” eval-
uation (Table 1). See the MAX847 data sheet for
descriptions of the programmable features and for
more information on serial programming.
To manually program data into the device, start with
SW1, SW2, and SW3 high. Then sequence through the
following steps:
1) Set SW3 (CS)
low.
2) Set the first desired data input bit with SW2.
3) Toggle the serial clock down and up with SW1. Data
is loaded on the SCL rising edge.
4) Repeat steps 2 and 3 for each of the next seven
input data bits (for a total of eight bits).
5) Set SW3 high.
Note:
Please indicate that you are using the MAX847 when
contacting these component suppliers.
_________________________Quick Start
The MAX847 EV kit is fully assembled and tested.
Follow these steps to verify board operation.
Do not
turn on the power supply until all connections are
completed.
1) Check the positions of jumpers JU1–JU12. See
Table 2 and the MAX847 data sheet for details.
Jumper connections for the MAX847 and MAX769
are not the same.
2) Check the positions of switches SW1–SW4.
SW1–SW3 should be high (closest to the top edge
of the evaluation board). When testing the MAX847,
SW4 should be low (to set Coast mode for start-up).
3) Connect a +1.5V supply voltage to the BATT pad.
The power-supply ground connects to the GND
pad.
4) Connect a voltmeter and load, if any, to the OUT
pad. Note that the MAX847 is designed to start in
low-power (COAST) mode—it cannot supply full
load until RUN mode is set after start-up (by SW4 or
by the serial interface).
5) Turn on the input power supply and verify that the
output voltage is 3.0V. This is the MAX847’s starting
OUT voltage. Other voltages can then be pro-
grammed via the serial interface (see MAX847 data
sheet).
Connectors
The MAX847 evaluation board contains provisions for
two types of connectors for serial-interface connec-
tions. One is a 6-pin single in-line header (J1) that con-
tains only serial-interface connections. The other is a
DB-25 pad footprint (J2) that has serial connections
along with other IC pin connections. Pin/pad connec-
tions are outlined in Tables 3 and 4.
Table 1. Switch and LED Functions
SWITCH/
LED
FUNCTION
COMMENTS
SW1
Manual Serial Clock
Input (SCL)
Logic-high level
is with
switch pushed toward
top of board.
Logic-low
level
is with switch
pushed toward switch
label “SW1”, “SW2”, etc.
SW2
SW3
Manual Serial Data
Input (SDI)
Manual Chip-Select
Input (CS)
RUN/COAST selec-
tion on MAX847 only
Visual Data Output
(SDO)
SW4
LED1
LED on is logic-high
output.
2
_______________________________________________________________________________________
MAX847 Evaluation Kit
Evaluates: MAX847
Table 2. Jumper Selection
JUMPER
NUMBER
JU1
MAX847
DEFAULT
POSITION
On
COMMENTS
JU1 should be inserted if no external synchronous clock is used. If an external synchronous
clock is applied, then JU1 should be removed.
With JU2 inserted, the low-battery input (LBI,
LBO)
is set to trip at 1V. With JU2 removed,
LBI is set for 0.6V.
JU2 should be removed when making no-load operating current
measurements
to prevent R12 and R14 from adding to the measured current.
With JU3 inserted, the reset input (RSIN,
RSO)
is set to trip at 1.6V. With JU3 removed, RSIN
is set for 0.6V.
JU3 should be removed when making no-load operating current mea-
surements
to prevent R15 and R16 from adding to the measured current.
JU4 connects a 100kΩ pull-up resistor (R17) from REG1 to the open-drain
RSO
output. JU4
can be removed if
RSO
is not used or if a different pull-up resistor is used.
JU5 connects a 100kΩ pull-up resistor (R10) from REG1 to the open-drain
LBO
output. JU5
can be removed if
LBO
is not used or if a different pull-up resistor is used.
JU6 connects an LED (LED1) to the serial data output (SDO). LED1 gives a visual indication
of serial output data when manually programming the IC with SW1, SW2, and SW3. JU6
should be removed when using a µP-controlled interface, since the LED will not be visible at
digital clock speeds.
JU6 should also be removed when making operating or quiescent-
current measurements.
JU7 connects SW1 to the serial clock input (SCL) (used to clock-in serial programming
data). Insert JU7 when programming the IC manually with SW1, SW2, and SW3.
Remove
JU7 when using a digital serial interface at connector J1 or J2.
JU8 connects SW2 to the serial data input (SDI) (used to set serial programming data).
Insert JU8 when programming the IC manually with SW1, SW2, and SW3.
Remove JU8
when using a digital serial interface at connector J1 or J2.
JU9 connects SW3 to the chip-select input (CS) (used to activate the serial interface). Insert
JU9 when programming the IC manually with SW1, SW2, and SW3.
Remove JU9 when
using a digital serial interface at connector J1 or J2.
JU10 connects SW4 to the RUN input (MAX847 only). Insert JU10 when setting the RUN
input manually with SW4.
Remove JU10 when controlling the RUN input through either
connector J1 or J2.
JU11 has three pins to connect the REG2 input (REG2IN) to either REG1 (jumper J11-1 to
J11-2) or OUT (jumper J11-2 to J11-3).
JU12 has four pins. When a MAX847 is inserted, connect these pins to jumper JU12-1 to
JU12-2 and jumper JU12-3 to JU12-4. When the MAX769 is inserted, connect these pins
only to jumper JU12-2 to JU12-3, leaving JU12-1 and JU12-4 open.
JU2
On
JU3
On
JU4
JU5
On
On
JU6
On
JU7
On
JU8
On
JU9
On
JU10
On
JU11
JU11-1, JU11-2
JU12-1, JU12-2,
JU12-3, JU12-4
JU12
_______________________________________________________________________________________
3
MAX847 Evaluation Kit
Evaluates: MAX847
Table 3. Connector Pinouts for J1 (6-Pin
Header)
J1 PIN
J1-1
J1-2
J1-3
J1-4
J1-5
J1-6
FUNCTION
REG1
CS
SDI
SCL
SDO
GND
Table 4. Connector Pinouts for J2 (DB-25)
J2-PIN
J2-1
J2-2
J2-3
J2-4
J2-5
J2-6
J2-7
J2-8
J2-9
J2-10
J2-11
J2-12
J2-13
J2-14
J2-15
J2-16
J2-17
J2-18
J2-19
J2-20
J2-21
J2-22
J2-23
J2-24
J2-25
FUNCTION
BATT
REG1
REG2
REG3
NICD
CS
RUN (MAX847 only, N.C. for MAX769)
SDO
SDI
N.C.
N.C.
N.C.
N.C.
N.C.
RSO
LBO
N.C.
SCL
GND
N.C.
N.C.
N.C.
N.C.
GND
GND
N.C. = No Connection
4
_______________________________________________________________________________________
GND
RUN
JU12-4 JU12-3 JU12-2 JU12-1
REG1
C3
0.1µF
SW3 2
3
1
CS
R6
BATT
CS
RUN
PGND
JU1
1µF
R21
10k
4
CS
SDI
SCL
SDO
SYNC
OUT
C16
0.1µF
R20
100k
C5
REG1
SDO
28
LX1
OUT
LED1
JU6
R5
100Ω
3
SDI
2
SDI
JU8
SCL
5
SCL
OUT
6
LBO
LBI
CH0
REF
NICD
1M
10
RSIN
RSO
DR1
R2IN
DR2IN
DR2
16
15
DRGND
AGND
REG3
20
REG3
REG2
19
22
21
C7
10µF
10V
1µF
OFS
14
C10
0.1µF
2
REG2
OUT
R1
15k
3
JU11 1
REG1
7
17
23
C14
NICD
REG1
24
C6
10µF
10V
11
R12
R11
R14
1k
620k
R16
REF
R15
OUT
JU3
R17
JU4
100k
R19
100k
18
1k
DR2
J2-17
N.C.
SCL
N.C.
N.C.
N.C.
N.C.
N.C.
J2-9
J2-10
SDI
N.C.
N.C.
N.C.
N.C.
N.C.
RSO
LBO
J2-24
J2-25
J2-22
J2-23
J2-20
J2-21
J2-18
J2-19
J2-11
J2-12
J2-13
J2-14
J2-15
J2-16
R18
DR1
620k
8
CHO
9
390k
JU2
C2
47µF
16V
25
1k
R8
1k
R7
100k
C12
0.1µF
C13
R3
1k
1k
27
JU9
SDO
R2
1k
26
1
D1
MBR0520L
SW4
2
R4
100k
L1
22µH
R23
100k
R22
1k
C8
0.1µF
C1
47µF
16V
BATT
BATT
JU10
C15
0.1µF
3
3
SW2
2
1
1
REG1
REG1
3
SW1
2
OPTIONAL
REF
1
J1-1
J1-2
J1-3
J1-4
J1-5
J1-6
Figure 1. MAX847 EV Kit Schematic
R9
100k
R10
100k
U1
MAX847
SYNC
13
R13
C11
1nF
FILT
12
C4
22nF
REG1
0.1µF
JU7
JU5
LBO
LBI
REG1
BATT
GND
RSI
REG1
RSO
REG1
DR2IN
J2-1
J2-2
BATT
REG1
J2-3
J2-4
REG2
REG3
J2-5
J2-6
NICD
CS
C9
1µF
Evaluates: MAX847
_______________________________________________________________________________________
J2-7
J2-8
RUN
SDO
MAX847 Evaluation Kit
5

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