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AT9880B

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ZHONGKEWEI GNSS Modules, QFN-40L-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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AT9880B

ZHONGKEWEI · GNSS Modules · QFN-40L-EP(5x5)

AT9880B from ZHONGKEWEI, in a QFN-40L-EP(5x5). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 RF1 input L1 band RF signal input; DC voltage on this pin must not exceed 0.8V, so a DC-blocking capacitor is needed if the external LNA output carries DC.
2 GND power_in Ground; connect to GND and use as part of the RF input isolation ground next to RF1.
3 VDD_ANA power_out Analog LDO output; connect a 1uF decoupling capacitor.
4 VX_OUT power_out Supply output for the external TCXO, typically 1.8V; connect a 1uF decoupling capacitor.
5 XREF input Reference clock input for an external TCXO (26 MHz, clipped sine, 0.5-1.5 Vpp).
6 TST_RF passive RF test port; leave unconnected when not used.
7 VDD_BK power_out Backup LDO output; a decoupling capacitor must be connected to this pin whether or not a backup supply is fitted.
8 VBAT power_in Backup power input for RTC and backup RAM, operating range 1.4-3.6V; may be left floating if no hot-start backup is needed.
9 VDD_IO power_in Digital I/O supply input, 2.7-3.6V (3.3V typical), also powering the power-on reset and antenna detect circuits.
10 ANT_BIAS bidirectional Active antenna bias output and detection; detection supply is VDD_IO up to 3.6V, with short-circuit protection limiting current to about 45-65 mA.
11 RTC_O passive RTC 32.768 kHz oscillator output for a passive crystal connected between RTC_I and RTC_O.
12 RTC_I passive RTC 32.768 kHz oscillator input for a passive crystal connected between RTC_I and RTC_O.
13 GPIO2/TXD1 bidirectional General-purpose I/O multiplexed as UART1 transmit (TXD1).
14 GPIO3/RXD1 bidirectional General-purpose I/O multiplexed as UART1 receive (RXD1).
15 Reserved bidirectional Reserved digital pin; leave unconnected when not used.
16 Reserved bidirectional Reserved digital pin; leave unconnected when not used.
17 nRST input External active reset input with internal pull-up; leave unconnected when not used.
18 GPIO1/RXD0 bidirectional General-purpose I/O multiplexed as UART0 receive (RXD0), the default navigation data interface.
19 GPIO0/TXD0 bidirectional General-purpose I/O multiplexed as UART0 transmit (TXD0), the default navigation data output.
20 GPIO27 bidirectional General-purpose I/O.
21 DX_IN power_in Internal DCDC input, 2.7-3.6V; place at least 2.2uF filter capacitance close to this pin.
22 DX_OUT passive Internal DCDC output; requires a 4.7uH inductor and at least 10uF output capacitor (recommended 4.7uH + 10uF), or left floating when an external core supply is used.
23 VCORE power_in Core LDO input, 1.2-3.6V; can be powered directly by an external supply.
24 VDD_BB power_out Digital core LDO output; connect a 2.2uF decoupling capacitor.
25 GPIO22 bidirectional General-purpose I/O, default function is 1PPS output.
26 Reserved bidirectional Reserved digital pin; leave unconnected when not used.
27 Reserved bidirectional Reserved digital pin; leave unconnected when not used.
28 Reserved bidirectional Test port; leave unconnected when not used.
29 ON_OFF input Shutdown control with internal pull-up; driving low puts the chip into sleep mode and high resumes full operation; leave unconnected when not used.
30 GPIO4 bidirectional General-purpose I/O; leave unconnected when not used.
31 GPIO5 bidirectional General-purpose I/O; leave unconnected when not used.
32 GPIO8 bidirectional General-purpose I/O; leave unconnected when not used.
33 GPIO7 bidirectional General-purpose I/O; leave unconnected when not used.
34 GPIO6 bidirectional General-purpose I/O; leave unconnected when not used.
35 GPIO10 bidirectional General-purpose I/O; leave unconnected when not used.
36 GPIO9 bidirectional General-purpose I/O; leave unconnected when not used.
37 DVDD passive PLL LDO output; connect a 1uF decoupling capacitor.
38 GND power_in Ground; connect to GND and use as part of the RF input isolation ground next to RF2.
39 RF2 input L5 band RF signal input; DC voltage on this pin must not exceed 0.8V, so a DC-blocking capacitor is needed if the external LNA output carries DC.
40 GND power_in Ground; connect to GND.
41 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer ZHONGKEWEI
Package QFN-40L-EP(5x5)
Category IoT/Communication Modules
Pins 41

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
电源对地电压(VDD_ANA/VDD_BB/DVDD/VDD_BK) -0.3 1.1 V 6
电源对地电压(VDD_IO/VCORE/VBAT/DX_IN) -0.3 4.1 V 6
模拟引脚电压(RTC_O/RTC_I) -0.3 4.1 V 6
射频输入管脚(RF1/RF2) -0.3 1.1 V 6
其他引脚电压 -0.3 4.1 V 6
射频输入功率 5 dBm 6
结温 125 ℃ 6
存储温度 -50 150 ℃ 6
VDD_IO VDD_IO 2.7 3.3 3.6 V 6
VBAT VBAT 1.4 3.3 3.6 V 6
VCore VCore 1.2 3.6 V 6
DX_IN DX_IN 2.7 3.3 3.6 V 6
工作温度 -40 85 ℃ 6
RF1 射频输入频率 1561.1 1575.42 1602 MHz 6
TCXO 晶振幅度 0.5 1.5 Vpp Peak to peak, clipped sine wave 6
有源天线短路保护电流 45 50 65 mA 6
低电平输入电压 Vil -0.3 0 V 7
低电平输出电压 Vol 0 0.4 V 7
复位电压 1.65 V @VDD_IO 6
复位时间 160 ms 6
TCXO 晶振频率 26 MHz 6
TCXO 晶振电源电压 VX_OUT 输出电压 VX_OUT 1.8 V 6
有源天线检测电流 3 mA VDD_IO=3.3V 6
天线检测电路压降 0.3 V 50mA@VDD_IO=3.3V 6
连续运行模式工作电流 25 mA 6
电池备份电流 30 uA 7
休眠模式电流 50 uA ON_OFF=0 7
RTC Crystal 频率 32.768 kHz 7
RTC Crystal 等效串联电阻 Rs Rs 80 kΩ 7
RTC Crystal 串联电容 12.5 pF 7
漏电流输入管脚 Ileak 1 uA 7
上拉电阻 Rpu 80 kΩ VDD_IO=3.3V 7
下拉电阻 Rpd 80 kΩ VDD_IO=3.3V 7

CAD (KiCad official)

  • Symbol: AT9880B
  • Footprint: Package_DFN_QFN:QFN-40-1EP_5x5mm_P0.4mm_EP3.6x3.6mm
  • 3D model: QFN-40L-EP(5x5) (KiCad packages3D, STEP)
  • 3D model files: at9880b-etched.step / at9880b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); at9880b.step / at9880b.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: ZHONGKEWEI datasheet (16 pp, sha256 5fe9aedab37df3ec, retrieved 2026-10-18, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF