STA5620 STMicroelectronics, STA5620 Datasheet - Page 22

• Manufacturer Part Number: STA5620
• Description: IC RF FRONT END RECEIVER 32VFQFP
• Manufacturer: STMicroelectronics

Specifications of STA5620

• Modulation Or Protocol: GPS
• Current - Receiving: 19mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2.5 V ~ 3.3 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-VFQFN
• Pin Count: 32
• Screening Level: Industrial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Frequency: -
• Applications: -
• Sensitivity: -
• Memory Size: -
• Data Rate - Maximum: -
• Lead Free Status / Rohs Status: Compliant

Chip enable and reset timing
8.1.1
22/29
Operating modes
The below table shows how select a particular default operating mode:
Table 14.
HIGH = VCC_IO; LOW = GND
MODE
LOW → sets the STA5620 internal dividers to work with 16.368 MHz reference and
HIGH → sets the STA5620 internal dividers to work with 19.2 MHz reference and
In both cases GPS_CLK pin provides 16.368 MHz clock to Base Band and SIGN pin
provides the DATA to Base Band.
CHIP_EN
LOW → the device goes to stand-by mode with very low power consumption.
HIGH → sets ON the internal blocks of the IC according to the RF_EN status;
A logic reset of the SPI registers is generated by the low to high transitions of the CHIP_EN
pin while the RF_EN is LOW.
RF_EN
LOW → the crystal oscillator and only one output buffer are enabled,
HIGH → the whole chip is active and functional;
TEST_EN1 → must be set LOW;
TEST_EN2 → 'must be set HIGH (VCC_IO);
Fully operating
RF Chain OFF
Crystal oscillator ON
Stand-by
All internal blocks OFF
Operating modes
GPS_CLK = ON and XTAL_CLK = OFF;
GPS_CLK = ON and XTAL_CLK = ON;
XTAL_CLK if MODE = 1 or GPS_CLK if MODE = 0;
Operating modes
MODE = 0
MODE = 1
STA5620 current
consumption
1.5 mA
15 mA
16 mA
1 µA
CHIP_EN
HIGH
HIGH
LOW
RF_EN TEST_EN1 TEST_EN2
HIGH
LOW
x
LOW
LOW
LOW
STA5620
HIGH
HIGH
HIGH