Table of Contents Section 1 – New and Featured Products
Table of Contents Section 1 – New and Featured Products
Table of Contents Section 1 – New and Featured Products
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®<br />
CPU Supervisors, System Management, RTC <strong>and</strong> Timing Solution <strong>Products</strong><br />
X40020, X40021, X40420, X40421 Dual Voltage Monitor with Integrated CPU Supervisor <strong>and</strong> System Battery Switch<br />
Product Highlights<br />
• CPU Supervisor with Dual Voltage Monitor<br />
• Built-in system battery switch<br />
• Ideally suited for dual-voltage applications with battery backup<br />
Key Features<br />
Two low V CC detection <strong>and</strong> reset assertion LVS<br />
• Two separate voltage monitors<br />
• V TRIP setting (electronically programmable)<br />
• St<strong>and</strong>ard V TRIP <strong>of</strong>ferings:<br />
V TRIP1<br />
V TRIP2<br />
4.6 (1%) 2.9 (1.7%)<br />
4.6 (1%) 2.6 (2%)<br />
2.9 (1.7%) 1.6 (3%)<br />
• Fault Detection Register (FDR)<br />
• 4K EEPROM (X40420/X40421 only)<br />
Benefits<br />
• Provides a reset when either V TRIP is triggered<br />
• Prevents system lock up <strong>and</strong> improves system accuracy<br />
• User programmable levels to meet special system requirements<br />
• Maintains SRAM contents or processor operations during<br />
main power failure<br />
• Fault detection register allows reliability tracking or special<br />
fault recovery operations<br />
• High accuracy V TRIP<br />
Description<br />
The X40020/X40420/X40420/X40421 Product Family combines<br />
power-on reset control, watchdog timer, supply voltage supervision,<br />
<strong>and</strong> secondary supervision, <strong>and</strong> manual reset, in one<br />
package. This combination lowers system cost, reduces board<br />
space requirements, <strong>and</strong> increases reliability.<br />
Applying voltage to V cc activates the power on reset circuit<br />
which holds RESET/RESET active for a period <strong>of</strong> time. This<br />
allows the power supply <strong>and</strong> system oscillator to stabilize<br />
before the processor can execute code.<br />
Low V CC detection circuitry protects the user’s system from low<br />
voltage conditions, resetting the system when V CC falls below<br />
the minimum V TRIP1 point. RESET/RESET is active until V CC<br />
returns to proper operating level <strong>and</strong> stabilizes. A second<br />
voltage monitor circuit tracks the unregulated supply to provide<br />
a power fail warning or monitors different power supply voltage.<br />
See Product Family Tree<br />
on page 2-3<br />
<strong>New</strong> & <strong>Featured</strong> <strong>Products</strong><br />
Pin Configuration<br />
X40420/21 Block Diagram*<br />
V2FAIL<br />
V2MON<br />
LOWLINE<br />
WDO<br />
MR<br />
RESET<br />
V SS<br />
X40420/X40020<br />
14-Pin SOIC, TSSOP<br />
1<br />
2<br />
3<br />
4<br />
5<br />
6<br />
7<br />
14<br />
13<br />
12<br />
11<br />
10<br />
9<br />
8<br />
V CC<br />
BATT-ON<br />
V OUT<br />
V BATT<br />
WP<br />
SCL<br />
SDA<br />
V CC<br />
V BATT<br />
MR<br />
(Manual<br />
Reset)<br />
+<br />
-<br />
System<br />
Battery<br />
Switch<br />
POR<br />
Delay<br />
V OUT<br />
RESET<br />
X40421/X40021<br />
14-Pin SOIC, TSSOP<br />
V2FAIL 1<br />
14 V CC<br />
V2MON 2<br />
13 BATT-ON<br />
LOWLINE<br />
WDO<br />
MR<br />
RESET<br />
3<br />
4<br />
5<br />
6<br />
12<br />
11<br />
10<br />
9<br />
V OUT<br />
V BATT<br />
WP<br />
SCL<br />
V SS 7<br />
8 SDA<br />
V 2MON<br />
V Trip1<br />
V Trip2<br />
+<br />
-<br />
Watchdog<br />
Timer<br />
LOWLINE<br />
V2FAIL<br />
WDO<br />
SCL<br />
SDA<br />
WP<br />
Serial<br />
Interface<br />
Control<br />
Register<br />
EEPROM<br />
Fault<br />
Detection<br />
Register<br />
*X40020 & X40021 are non-memory options<br />
www.xicor.com<br />
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