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19-3418; Rev 0; 9/04
MAX6870 Evaluation System/Evaluation Kit
General Description
The MAX6870 evaluation system (EV system) consists of a MAX6870 evaluation kit (EV kit) and a Maxim CMOD232 command module. The MAX6870 EEPROMconfigurable, multivoltage supply sequencer/supervisor monitors several voltage-detector inputs, two auxiliary inputs, and four general-purpose logic inputs, and features programmable outputs for highly configurable power-supply sequencing applications. The evaluation software runs under Windows(R) 95/98/2000/XP, providing a handy user interface to exercise the features of the MAX6870. Order the complete EV system (MAX6870EVCMOD2) for comprehensive evaluation of the MAX6870 using a PC. Order the EV kit (MAX6870EVKIT) if the command module has already been purchased with a previous Maxim EV system, or for custom use in other C-based systems. This system can also evaluate the MAX6871-MAX6875. Contact factory for a free sample of MAX6871ETJ, MAX6872ETJ, MAX6873ETJ, MAX6874ETJ, or MAX6875ETJ. Proven PC Board Layout Complete Evaluation System Convenient On-Board Test Points Fully Assembled and Tested
Features
Evaluate: MAX6870-MAX6875
Ordering Information
The MAX6870 EV software is designed for use with the complete EV system MAX6870EVCMOD2 (includes CMOD232 module together with MAX6870EVKIT). If the MAX6870 evaluation software will not be used, the MAX6870EVKIT board can be purchased by itself, without the CMOD232 module.
PART MAX6870EVKIT MAX6870EVCMOD2 TEMP RANGE 0C to +70C 0C to +70C INTERFACE TYPE User supplied Windows software, RS-232 port
MAX6870 Stand-Alone EV Kit
The MAX6870 EV kit provides a proven PC board layout to facilitate evaluation of the MAX6870. It must be interfaced to appropriate timing signals for proper operation. Connect power, ground return, and SCL/SDA interface signals to the breakout header pins (see Figure 9). The LEDs and load-switching FETs are optional circuits, which can be powered separately or disabled altogether. Refer to the MAX6870 data sheet for timing requirements.
PART MAX6870EVKIT CMOD232 QTY 1 1
Parts List
DESCRIPTION MAX6870 evaluation kit Command module
Component List
DESIGNATION C1, C2 QTY 2 DESCRIPTION 1F, 6.3V X7R ceramic capacitors (0603) TDK C1608X7R0J105K 0.1F, 25V X7R ceramic capacitors (0603) TDK C1608X7R1E104K Open (0603) 3-pin headers Open 8-pin headers 30V, 200mA Schottky diode (SOT23) Zetex BAT54CTA common cathode Diodes Incorporated BAT54C Fairchild BAT54C General Semiconductor BAT54C
MAX6870 EV System
The MAX6870 evaluation system software runs under Windows 95/98/2000/XP on an IBM-compatible PC, interfacing to the EV system board through the computer's serial communications port. See the Quick Start section for setup and operating instructions.
C3-C7 C8 JU1-JU8 JU9-JU14 H1-H4
5 0 8 0 4
D1
1
Windows is a registered trademark of Microsoft Corp.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX6870 Evaluation System/Evaluation Kit Evaluate: MAX6870-MAX6875
Component List (continued)
DESIGNATION LED1-LED4, LED9, LED12, LED14, LED15 LED5-LED8, LED10, LED11, LED13, LED16 P1 Q1-Q4 QTY 8 DESCRIPTION Red LEDs (T1-3/4) DESIGNATION R1, R2 R3-R18 R19 U1 8 1 4 Green LEDs (T1-3/4) 2 x 10 right-angle receptacle Logic-level FETs, 2.7A at 30V (SOT23) Fairchild FDN359AN None None QTY 2 16 1 1 8 1 DESCRIPTION 100k 5% resistors (0805) 1k 5% resistors (0805) 100 5% resistor (0805) MAX6870ETJ (32-pin QFN) Shunts PC board, MAX6870 EV kit
Component Suppliers
SUPPLIER Diodes Inc Fairchild General Semiconductor TDK Zetex USA PHONE 805-446-4800 888-522-5372 760-804-9258 847-803-6100 631-543-7100 FAX 805-446-4850 Local rep only 760-804-9259 847-390-4405 631-864-7630 WEBSITE www.diodes.com www.fairchildsemi.com www.gensemi.com www.component.tdk.com www.zetex.com
Note: Indicate you are using the MAX6870 when contacting these component suppliers.
Quick Start
Required Equipment
Before you begin, the following equipment is needed: * Maxim MAX6870EVCMOD2 (contains MAX6870 EV kit board and CMOD232 module) * * * DC power supply, 9VDC at 200mA (included with CMOD232 module) Windows 95/98/2000/XP computer with a spare serial (COM) port 9-pin I/O extension cable
3) Connect a cable from the computer's serial port to the CMOD232 module. If using a 9-pin serial port, use a straight-through, 9-pin female-to-male cable. If the only available serial port uses a 25-pin connector, a standard 25-pin to 9-pin adapter will be required. The EV kit software checks the modem status lines (CTS, DSR, DCD) to confirm that the correct port has been selected. 4) Install the evaluation software on your computer by running the INSTALL.EXE program on the disk. The program files are copied and icons are created for them in the Windows Start menu. 5) Connect the DC power supply to the CMOD232 module at input jack P1. 6) Start the MAX6870 program by opening its icon in the Start menu. 7) After the software locates the CMOD232 module and the MAX6870EVKIT board, the software polls the device status, updating the status bar.
Procedure
Do not turn on the power until all connections are made: 1) Ensure that JU1-JU8 are in the 1-2 position. Jumper sites JU9-JU14 are empty. See the Jumper Function Tables section. 2) Carefully connect the boards by aligning the 20-pin header of the MAX6870 EV kit with the 20-pin connector of the CMOD232 module. Gently press them together. The two boards should be flush against one another.
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MAX6870 Evaluation System/Evaluation Kit
Detailed Description of Software
Main Window
The evaluation software's main window shows a block diagram of the MAX6870, with many clickable features. Clicking on different parts of the block diagram leads to different feature tabs. Clicking Back returns to the main window's block diagram tab. Configuration register changes made with the GUI are written when the Apply button is clicked. Configuration of the device may be reread by clicking Refresh. Press function key F1 at any time to return to the block diagram tab sheet. Press function key F2 to pop up a window displaying registers pertinent to the selected feature. The software reads the data registers automatically, unless disabled by unchecking poll inputs every 2s under the options menu. At startup, the evaluation software reads the device configuration from the device registers. GPI_ condition in the fault register. This fault register status is displayed in the status bar.
Evaluate: MAX6870-MAX6875
Outputs Tab
The PO_ signals assert when a selected combination of other signals become asserted. Some PO_ signals allow only a single combination (i.e., a single product term), while other PO_ signals can be asserted by two different combinations (i.e., a sum of two product terms). The voltage monitors and the watchdog timers are internal signals. The GPI_ pins are external inputs. Additionally, one PO_ signal may depend on another PO_. When a PO_ signal is asserted, several actions can occur. The corresponding PO_ pin can be driven to a high or low logic level. The pin driver can be configured as an open-drain or as a push-pull output. When in pushpull mode, several system power-supply voltages are available, including some charge-pump voltages that are higher than the IN_ voltages. The user EEPROM pages can optionally be locked out when the PO_ is asserted. The manual reset (MR) input forces the PO_ signal to its asserted state. A programmable output cannot depend solely on MR. Refer to the MR section of the MAX6870 data sheet. The MARGIN signal allows user system testing by forcing the PO_ signal to a logic-high or logic-low state, or holding the previously determined state. It is generally expected that MARGIN will be high during normal operation.
Voltage Monitor Tab
The voltage monitor tab configures voltage monitor thresholds, selects the internal or external reference voltage (if applicable), and displays ADC conversion results (if applicable). To configure one of the IN1-IN6 pins as a window comparator, first set the primary threshold (A) to the lower limit, then set the secondary threshold (B) to the upper limit, and finally, configure the secondary threshold (B) as an overvoltage detector. When configuring a PO_ output to respond to this fault as a window comparator, select both the A and the B thresholds. When a voltage monitor detects the (A) or (B) threshold is crossed, a fault condition is asserted. This fault register status is displayed in the status bar. V2A_ indicates that IN2 is under its A threshold, V3_B indicates that IN3 has crossed its B threshold, and V6AB indicates that IN6 has crossed both its A and B thresholds. The software uses the reference voltage value to calculate the threshold and ADC voltages. The MAX6870 and MAX6871 include an analog-to-digital converter (ADC). The software automatically reads and displays channels selected under ADC Conversion Results.
Watchdog Timers Tab
A watchdog timer asserts a fault condition after a period of time, unless the timer is periodically reset by an input pin being toggled. This fault register status is displayed in the status bar as WD1 or WD2. During normal operation, an enabled watchdog timer must be serviced by toggling a GPI pin periodically. Typically, an external piece of firmware services the watchdog timer by toggling a GPI pin inside a loop, and watchdog timer assertion is configured to drive a PO_ output pin. Any software defect that halts the firmware then causes the watchdog timer to assert. The initial timeout period can be set to a longer value to allow time for software initialization. Alternatively, the watchdog timer can be held in reset by an optional clear input. Refer to the MAX6870 data sheet for more information about watchdog timer operation.
Digital Inputs Tab
Digital inputs GPI1-GPI4 can be configured for activehigh or active-low logic. When a GPI_ pin is configured active high, a logic-high level asserts the corresponding
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MAX6870 Evaluation System/Evaluation Kit Evaluate: MAX6870-MAX6875
Registers Tab
The Registers tab displays the volatile working registers of the MAX6870. Pressing Refresh reads and displays all register values. Individual register bytes can be modified by selecting the appropriate grid cell and typing zero-x prefix (0x) followed by two hexadecimal digits 0-9/A-F. If options menu item Confirm REG Write when editing is checked, a dialog box appears to confirm each byte written in this manner. At power-up, the MAX6870 automatically loads its registers from the configuration EEPROM page. To store the active register values into the configuration EEPROM, press Commit to EEPROM. The Re-load from EEPROM command sends 88h, rebooting the MAX6870. Register values can optionally be stored into a text file on disk for later retrieval, using the Load from File and Save to File buttons. Programmable outputs PO1-PO4 drive an optional load-switching demonstration circuit. User-provided power supplies at IN3-IN6 can drive loads OUT3, OUT4, OUT5, and OUT6. The circuit can be demonstrated using LED10, LED11, LED13, LED16 as onboard loads, or by connecting external loads to the OUT3-OUT6 oval pads. Q1-Q4 are susceptible to ESD damage if gates are left floating. Programmable outputs PO5-PO8 can be configured to drive LED indicators.
Evaluating the MAX6871-MAX6875
With power off, replace U1 with a MAX6871ETJ, MAX6872ETJ, MAX6873ETJ, MAX6874ETJ, or MAX6875ETJ. The software automatically detects the device type and disables unused features accordingly.
Diagnostics Window
The diagnostics window is used for factory testing prior to shipping the evaluation kit. It is not meant for customer use.
EEPROM Tab
The EEPROM tab displays the nonvolatile EEPROM memory pages of the MAX6870. Pressing Refresh reads and displays the selected EEPROM page. Individual memory bytes can be modified by selecting the appropriate grid cell and typing zero-x prefix (0x) followed by two hexadecimal digits 0-9/A-F. If options menu item Confirm EEPROM Write when editing is checked, a dialog box appears to confirm each byte written in this manner. EEPROM values can optionally be stored into a text file on disk for later retrieval, using the Load from File and Save to File buttons.
Jumper Function Tables
Tables 1-13 are jumper function tables.
Table 1. Jumper JU1
JU1 SHUNT POSITION Open 1-2 2-3* FUNCTION PO1 available for user circuitry. LED11, LED12, OUT3, Q2 disconnected. PO1 low lights LED12; Q2 gate is left floating. PO1 high turns on Q2, connecting OUT3 to IN3. LED11 lights if IN3 > 3V.
Detailed Description of Hardware
The MAX6870 (U1) is surrounded by breakout header pins H1-H4. Two internally generated voltage sources are bypassed by capacitors C1 and C2. The user power-supply inputs IN1 and IN3-IN6 are bypassed by capacitors C3-C7. If an external reference is used, capacitor site C8 should be loaded with a suitable bypass capacitor. Otherwise, C8 can be left open. Connector P1 mates with the CMOD232 module, which enables communication with software running on a PC. (There are SCL/SDA pullup resistors on the module board.) As a convenience, the module also provides 5V DC power to U1 through D1, R19, and jumper JU13. This same 5VDC power supply also powers most of the EV kit LEDs through jumper JU14.
*Indicates default configuration, set by an installed shunt.
Table 2. Jumper JU2
JU2 SHUNT POSITION Open 1-2 2-3* FUNCTION PO2 available for user circuitry. LED9, LED10, OUT4, Q1 disconnected. PO2 low lights LED9; Q1 gate is left floating. PO2 high turns on Q1, connecting OUT4 to IN4. LED10 lights if IN4 > 3V.
*Indicates default configuration, set by an installed shunt.
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MAX6870 Evaluation System/Evaluation Kit Evaluate: MAX6870-MAX6875
Table 3. Jumper JU3
JU3 SHUNT POSITION Open 1-2 2-3* FUNCTION PO3 available for user circuitry. LED14, LED13, OUT5, Q3 disconnected. PO3 low lights LED14; Q3 gate is left floating. PO3 high turns on Q3, connecting OUT5 to IN5. LED13 lights if IN5 > 3V.
Table 6. Jumper JU6
JU6 SHUNT POSITION Open 1-2* 2-3 FUNCTION PO6 available for user circuitry. LED2, LED7 disconnected. PO6 low lights LED2. PO6 high lights LED7 (unless configured in open-drain mode or insufficient pullup source voltage).
*Indicates default configuration, set by an installed shunt.
*Indicates default configuration, set by an installed shunt.
Table 4. Jumper JU4
JU4 SHUNT POSITION Open 1-2 2-3* FUNCTION PO4 available for user circuitry. LED15, LED16, OUT6, Q4 disconnected. PO4 low lights LED15; Q4 gate is left floating. PO4 high turns on Q4, connecting OUT6 to IN6. LED16 lights if IN6 > 3V.
Table 7. Jumper JU7
JU7 SHUNT POSITION Open 1-2* 2-3 FUNCTION PO7 available for user circuitry. LED3, LED6 disconnected. PO7 low lights LED3. PO7 high lights LED6 (unless configured in open-drain mode or insufficient pullup source voltage).
*Indicates default configuration, set by an installed shunt.
*Indicates default configuration, set by an installed shunt.
Table 5. Jumper JU5
JU5 SHUNT POSITION Open 1-2* 2-3 FUNCTION PO5 available for user circuitry. LED1, LED8 disconnected. PO5 low lights LED1. PO5 high lights LED8 (unless configured in open-drain mode or insufficient pullup source voltage).
Table 8. Jumper JU8
JU8 SHUNT POSITION Open 1-2* 2-3 FUNCTION PO8 available for user circuitry. LED4, LED5 disconnected. PO8 low lights LED4. PO8 high lights LED5 (unless configured in open-drain mode or insufficient pullup source voltage).
*Indicates default configuration, set by an installed shunt.
*Indicates default configuration, set by an installed shunt.
Table 9. Jumpers JU9, JU10 (Device Address Selection)
JU9 SHUNT POSITION Closed* Open Closed Open JU10 SHUNT POSITION Closed* Closed Open Open A0 0 1 0 1 A1 0 0 1 1 DEVICE ADDRESS 1010 00x r/w 1010 01x r/w 1010 10x r/w 1010 11x r/w
*Indicates default configuration, which is a trace on the PC board.
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MAX6870 Evaluation System/Evaluation Kit Evaluate: MAX6870-MAX6875
Table 10. Jumper JU11 (MR)
JU11 SHUNT POSITION Open* Closed MR 1 0 FUNCTION Normal operation Manual reset
*Indicates default configuration.
Table 11. Jumper JU12 (MARGIN)
JU12 SHUNT POSITION Open* Closed MARGIN 1 0 Normal operation. User test mode: PO outputs are set to their configured MARGIN state. Refer to the MAX6870 data sheet. FUNCTION
*Indicates default configuration.
Table 12. Jumper JU13 (Device Power)
JU13 SHUNT POSITION Open Closed* FUNCTION U1 must be powered by a user-supplied external supply connected to IN1, IN3-IN6. U1 input IN1 is powered from connector P1 5V supply (the CMOD232 module).
*Indicates default configuration, which is a trace on the PC board.
Table 13. Jumper JU14 (LED Power)
JU14 SHUNT POSITION Open Closed* FUNCTION LED1-LED16 are unused, or can be externally powered. LED1-LED16 are powered from connector P1 5V supply (the CMOD232 module).
*Indicates default configuration, which is a trace on the PC board.
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MAX6870 Evaluation System/Evaluation Kit Evaluate: MAX6870-MAX6875
Figure 1. Block Diagram (Can Be Brought Up Anytime by Pressing Function Key F1)
Figure 2. Related Registers Adjunct Window (Shown by Pressing Function Key F2) _______________________________________________________________________________________ 7
MAX6870 Evaluation System/Evaluation Kit Evaluate: MAX6870-MAX6875
Figure 3. Voltage Monitor Tab
Figure 4. Digital Inputs
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MAX6870 Evaluation System/Evaluation Kit Evaluate: MAX6870-MAX6875
Figure 5. Programmable Outputs
Figure 6. Watchdog Timers
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MAX6870 Evaluation System/Evaluation Kit Evaluate: MAX6870-MAX6875
Figure 7. Registers
Figure 8. EEPROM Memory
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R8 1k 1 JU2 PO2 D1 JU13 IN3 H4-4 H4-3 26 IN5 IN6 24 AUXIN1 AUXIN2 PO3 DBP 3 PO4 U1 1 JU4 PO4 H1-4 GND LED1 LED2 LED3 LED4 2 JU14 3 LED5 LED6 LED7 LED8 9 H1-8 JU8 3 8 1 H1-7 2 PO7 PO8 N.C. N.C. JU7 3 7 1 H1-6 2 PO6 JU6 3 6 1 H1-5 2 JU5 PO5 5 1 GP11 GP12 GP13 GP14 MR SDA SCL A0 A1 20 19 18 17 MARGIN H3-4 H3-3 H3-2 H3-1 R3 1k 4 R4 1k R5 1k R6 1k 2 3 ABP 21 H3-5 23 22 H3-6 C2 1F 6.3V 25 H4-2 H4-1 27 IN3 IN4 IN4 IN5 IN6 R9 1k 1 LED12 IN3 3 IN1 PO1 IN2 Q2 1 PO2 H1-1 PO2 PO3 H1-2 PO4 H1-3 2 VREFIN 1 2 PO3 LED11 R10 1k 3 32 31 29 30 H4-5 28 OUT3 1 JU3 2 3 H4-8 H4-7 H4-6 3 R19 100 VCC 2 3 C8 OPEN
LED9
IN4
3
C3 0.1F 25V C4 0.1F 25V C5 0.1F 25V C6 0.1F 25V C7 0.1F 25V
Figure 9. MAX6870 EV Kit Schematic
1 JU1 2 H3-8 H3-7 C1 1F 6.3V
OUT4
Q1
1
2
LED10
R7 1k
R11 1k
LED14
IN5
3
OUT5
Q3
1
2
LED13
R12 1k
R14 1k
LED15
IN6
MAX6870
3
OUT16
Q4
1
2
LED16
R13 1k
P1
VCC
2 x 10 HEADER
10
11
P1-2 P1-4 P1-6 P1-8 R16 1k R15 1k R18 1k R17 1k
P1-1 P1-3 P1-5 P1-7
12 13 14 H2-3 H2-4 H2-5 H2-6 H2-1 H2-2
15
16 H2-7
H2-8
P1-10 P1-9
JU12
JU11 JU9 JU10
P1-12 P1-11 P1-14 P1-13 P1-16 P1-15
P1-18 P1-17
MAX6870 Evaluation System/Evaluation Kit
Evaluate: MAX6870-MAX6875
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R1 100k R2 100k
P1-20 P1-19
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MAX6870 Evaluation System/Evaluation Kit Evaluate: MAX6870-MAX6875
Figure 10. MAX6870 EV Kit Component Placement Guide--Component Side 12 ______________________________________________________________________________________
MAX6870 Evaluation System/Evaluation Kit Evaluate: MAX6870-MAX6875
Figure 11. MAX6870 EV Kit PC Board Layout--Component Side
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MAX6870 Evaluation System/Evaluation Kit Evaluate: MAX6870-MAX6875
Figure 12. MAX6870 EV Kit PC Board Layout--Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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