Manual

RF22
Version: 0.1 Date: 12/23/2008
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44
RSSI vs Input Power
0
50
100
150
200
250
-120 -100 -80 -60 -40 -20 0 20
In Pow [dBm]
RSSI
Figure 30. RSSI Value vs. Input Power
8.12. Analog and Digital Test Bus
A differential analog test bus (ATB) is integrated into the RF22 to provide access to internal analog signals for
debugging and test purposes. The available signals are shown in Table 25 and are controlled by the atb[4:0] field in
"Register 50h. Analog Test Bus Select". The ATB signals are available on GPIO pins.
Add R/W Function/Description D7 D6 D5 D4 D3 D2 D1 D0 POR Def. Notes
50 R/W Analog Test Bus atb[4] atb[3] atb[2] atb[1] atb[0] 00h ATB
51 R/W Digital Test Bus ensctest dtb[4] dtb[3] dtb[2] dtb[1] dtb[0] 00h DTB
Table 25. Analog Test Bus
atb[4:0] GPIOx GPIOx
1 MixIp MixIn
2 MixQp MixQn
3 PGA_Ip PGA_In
4 PGA_QP PGA_Qn
5 ADC_vcm ADC_vbn
6 ADC_refmid ADC_vbiasp
7 ADC_vcm ADC_vcmb
8 ADC_ipoly10u ADC_ref
9 ADC_refdac_p ADC_refdac_m
10 ADC_Res1i_p ADCRes1i_m
11 ADC_Res1q_p ADC_Res1q_m
12 ADC_Res2i_p ADCRes2i_m
13 ADC_Res2q_p ADC_Res2q_m
14 ADC_Res3i_p ADCRes3i_m
15 ADC_Res3q_p ADC_Res3q_m
16 spare spare
17 ADC_RES_CAL_cap ADC_RES_CAL_res
18 ICP_Test PLL_IBG_05
19 PLL_VBG VSS_VCO
20 Vctrl_Test PLL_IPTAT_05
21 PA_vbias spare
22 DIGBG DIGVFB
23 IFBG IFVFB
24 PLLBG PLLVReg
25 IBias10u IBias5u
26 32KRC_Ucap 32KRC_Ures
27 ADC8_VIN ADC8_VDAC
28 LBDcomp LBDcompref
29 TSBG TSVtemp