STM1403 3 V FIPS-140 security supervisor with battery switchover Features STM1403 supports FIPS-140 security level 3+ Four high-impedance physical tamper inputs Over/under operating voltage detector Security alarm (SAL) on tamper detection Supervisory functions Automatic battery switchover RST output (open drain) Manual (push-button) reset input (MR) Power-fail comparator (PFI/PFO) QFN16, 3 mm x 3 mm (Q) Vccsw (V switch output) CC Low when switched to V CC High when switched to V (BATT ON BAT indicator) Battery low voltage detector (power-up) Optional V (1.237 V) REF (Available for STM1403A only) Low battery supply current (2.8 A, typ) Secure low profile 16-pin, 3 x 3 mm, QFN package Table 1. Device summary Standard Physical Over/under V REF V status, Vccsw status, OUT Device supervisory tamper voltage (1.237 V) during alarm during alarm (1) functions inputs alarms option (2) STM1403A ON Normal mode (3) (4) STM1403B Note High-Z High (4) STM1403C Note Ground High 1. Reset output, power-fail comparator, battery low detection (SAL, RST, PFO, and BLD are open drain). 2. Normal mode: low when V is internally switched to V and high when V is internally switched to battery. OUT CC OUT 3. Contact local ST sales office for availability. 4. Pin 9 is the V pin for STM1403A. It is the V pin for STM1403B/C. REF TPU November 2010 Doc ID 13232 Rev 6 1/34 www.st.com 1 Obsolete Product(s) - Obsolete Product(s)Contents STM1403 Contents 1 Description . 6 1.1 V pin modes . 6 OUT 1.1.1 STM1403A 6 1.1.2 STM1403B 6 1.1.3 STM1403C 6 2 Pin descriptions . 11 2.1 SAL, security alarm output (open drain) 11 2.1.1 TP , TP 1 3 11 2.1.2 TP , TP 2 4 11 2.1.3 Vccsw, V switch output . 11 CC 2.1.4 BLD, V low voltage detect output (open drain) . 12 BAT 2.1.5 Active-low RST output (open drain) 12 2.1.6 MR, manual reset input . 12 2.1.7 PFO, power-fail output (open drain) 12 2.1.8 PFI, power-fail input 12 2.1.9 V , reference voltage output (1.237, typ) 12 REF 2.1.10 V OUT . 13 2.1.11 V TPU . 13 2.1.12 V CC 13 2.1.13 V BAT 13 2.1.14 V SS . 13 3 Operation . 14 3.1 Reset input 14 3.2 Push-button reset input 14 3.3 Backup battery switchover 14 3.4 Power-fail input/output . 15 3.5 Applications information 15 3.6 Negative-going V transients and undershoot 16 CC 4 Tamper detection . 17 4.1 Physical 17 2/34 Doc ID 13232 Rev 6 Obsolete Product(s) - Obsolete Product(s)