US Patent No. 10,194,009


Patent No. 10,194,009
Issue Date January 29, 2019
Title Interface Device Providing Intrinsic Safety For A Communications Device
Inventorship Murali Krishna Bezawada, Hyderabad (IN)
John Boettger, Rockledge, FL (US)
Bart Meijer, Zuid Holland (NL)
Tushar N Nisith Shrimankar, Nagpur (IN)
Assignee Honeywell International Inc., Morris Plains, NJ (US)

Claim of US Patent No. 10,194,009

1. An interface device for providing Intrinsic Safety to a Smart Identity Module (SIM) card, comprising:a buffer circuit including a voltage regulator and a voltage level translator including drivers having a baseband processor side pins including at least an input/output (IO) pin for receiving data signals, first SIM reset (RST) pin, core power supply (VCC) pin, a clock (CLK) pin, a battery power supply (VBAT) pin, and SIM side pins including at least a VCC pin, a SIM CLK pin, second SIM RST pin, and a SIM IO pin, and a ground (GND) pin, and
at least one series resistor (R1, R2, R3, R4 and R5) in series with each of said baseband processor side pins,
wherein lower resistance ones of said series resistors are in series with said CLK pin and said IO pin as compared to ones of said series resistors that are in series with said first RST pin and said VCC pin.